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How to install vent under sink
Install AAV air admittance valve
E-mail: geno03245w@gmail.com
3 DFU is enough vent for 1 toilet + 1 sink + 1 tub-or-shower
Kitchen sink requires minimum 2 DFU
Washing machine 2 DFU
Oatey vent
Oatey sure vent
6 DFU

Approved to vent pipes up to 2"

Best air admittance valve:
1 piece vent and tubular adapter
1 piece vent and tubular adapter

Resource:
Oatey 6 DFU .pdf
Connect to tubular sink drain

Resource:
Oatey 6 DFU spec sheet
Oatey sure vent 20 DFU
Oatey sure vent
20 DFU

Approved to vent pipes up to 3"

Best air admittance valve:
Admittance valve 20 DFU vent

Oatey sure vents are 100% closed if they fail... so never sewer gas odor. Glue to 1-1/2" or 2" PVC

Resource:
Oatey sure vent installation

sure vent wall box
Sure vent wall box
So vent can draw air

Buy louvered access box:
Oatey sure vent wall box
Oatey access panels
Louvered access required for inside-the-wall sure vent

Sure vent requires open access to air; to draw air, and for visual inspection, and for replacement
tubular drain pipes
Buy Extra tubular parts
Tubular drain pipe
Flexible coupling
1-1/2 to 1-1/4 connector
Chrome flexible drain pipe

Buy
T plus 2 at Amazon
T plus 2 with applicator brush
Apply to each washer for first-time, no leak tubular drain pipe assembly.
Messy but good. Keep off clothes, and wipe hands to prevent getting it all over everything.
Does not dry out in can.
1/4 pint: handy size for DIYers



Avoid: Do not use black vents... rated 1 DUF ... good for a bar sink with single drain ...  but fail in open position, letting gas enter home at failure
Septic smell  Keep septic smell, and flammable methane gas out of house
Add plumbing ventAdd a vent to keep septic smell out of house
And improve line drainage

If sink does not have gurgling sound, or septic smell, and drains well, then vent is probably installed.
If sink has odor, fill trap with water and see if problem was caused by water evaporated from trap. Evaporation takes months, not days.
vent stackHome must have at least one 3-4" main vent stack
vent stack
Vent stack on roof. Must meet code for distance above roofing material. 6" minimum.
To use sure-vent and meet code, the home MUST have at least 1 main stack vent to roof

I never met a plastic roof boot / roof jack that didn't leak at one point.
Use lead ... it will last forever
Buy:
Lead roof boot
Roof boots
Do you need a vent?
Each sink, shower and bathtub must have 1) a trap filled with water to stop sewer gas from entering home, and 2) each trap must have a vent

Symptoms of no trap are usually a strong sewer smell.
If sink does not have trap, then a trap must be installed.
Exception, a shop sink or hand-washing sink that is not connected to sewer line and drains into a floor grate etc.

Symptoms of no vent or inadequate vent include:
1) Gurgling sound at trap when water is draining
2) Sewer gas odor inside room
3) Vent stack not visible on roof above each bathroom and kitchen above (look inside attic/ and on roof)
4) Sink directly in front of window often do not have vent
5) Island sink
6) Slow drain
7) Drain constantly clogging
8) S-trap going through floor instead of P-trap going through wall

If a sink does not have a vent, then an AAV (or air admittance valve, or sure-vent, or under sink vent) should be installed.

To successfully use sure-vent and meet code, the home MUST have at least 1 main stack vent to roof
Oatey sure vent Oatey sure vent / 20 DFU approved for drains up to 3" diameter
20 DUF is approved to successfully work on drain pipes up to 3" diameter

The 20 DUF is made to solvent welded to 1-1/2" or 2" PVC pipe
This vent can be added to S-trap, or any sink or bath drain etc.

DFU rating is printed on each air admittance vent.
DFU means Drainage Fixture Unit.
The correct DUF rating is needed to meet plumbing codes.
Improper DFU can cause slow drainage, gurgling and cause sewer gas to enter home.

Buy sure-vent:
Oatey 20 DFU vent
Air admittance valves

Resources:
Oatey 6 DFU vent specification sheet
DFU specification chart
20 DFU .pdf
Add vent to S-trap
Larger image
... Adding a 20 DFU sure-vent to S-trap
S-Trap goes through floor
Vent must be in vertical position. The vent will not work in horizonal position.
handBuy:  Parts for S trap installation:
Tee
90° elbow
Slip joint extension
1-1/2" trap adapter
buy 12" trap adapter and cut off lengths of 1-1/2" tubular pipe
Sure vent
Oatey sure vent with tubular adapter
Oatey 39225
Washers
Replacement S-traps if needed
T plus 2 thread sealant
P-traps and trap adapter



handInstructions
Use the sure-vent anywhere it can be installed.
Must have enough space to fit

Take photo first.
The illustration shows 1-1/2-Inch Slip Joint tubular drain.
The tubular pipes and pieces are fitted into each other, then a nut is hand tightened, causing a washer to seal against the pipe, preventing water leak.

Alway start by taking apart the trap first .... put a bucket under the trap and remove trap.
Dissemble and clean all parts and pieces.
Do not remove tailpieces that are connected to drain and disposal.
You cannot move tubular drain lines around and expect to seal them again without taking apart and cleaning with damp paper towel or rag.
All parts and pieces except tailpiece are taken apart.

You can cut pieces as needed using hack saw.
Tubular drain parts can be fitted many ways .. so improvise

handWhen you reassemble the drain pipes, do not tighten until the whole thing is assembled ... once all pieces are assembled, then tighten everything firmly using hands.
I recommend using T+2 on each tubular drain washer.
More steps lower on page
Add a plumbing vent Trap adapter
Larger image
Solvent weld the 20 DFU Sure-vent to PVC pipe
Use primer to clean all PVC surfaces that will be connected.
Primer has applicator. Protect floors and belongings from primer drips
Let primer dry a few minutes.
Glue 1 joint at a time. Glue has applicator.
Apply generous amount of glue over entire surface of pipe.
Immediately push the pipe into place. Push pieces together fully, and quickly.
A moment later you will not be able to move the pipe.
Glue next connection etc. Let dry for a few hours
trap adapter
Female Trap adapter
purpose: Connect tubular drain pipe to PVC.
Buy:
Female trap adapters
PVC cleanrer primer
Buy:
PVC cleaner
PVC cement
Buy: solvent weld:
PVC cement at Amazon
Resource:
Selection chart for solvent weld
Oatey sure vent Oatey vent
Oatey sure vent 6 DFU approved for drains up to 2" diameter
All in one vent for under sink
This all-in-one sure-vent is made for 1-1/2" tubular drain
No solvent welding needed

Buy: sure-vent air admittance valve:
1 piece vent and tubular adapter
1 piece vent and tubular adapter
Oatey 39225
add a ventLarger image...
Add 6 DFU sure-vent to P-trap
S-trap goes through the floor, but P-trap goes through wall.
The code requirement is minimum 4" space between horizontal pipe and actual vent. The Oatey all-in-one 39225 meets requirement.
Oatey 6 DFU vent specification sheet

Vent must be located at least 2 pipe diameters (3") away from the 'trap weir,' or the last bend in the trap.
Buy:
Oatey sure vent with tubular adapter
Sure vent with tubular adapter
Sure vents at Amazon

Buy: other parts:
P-traps and trap adapter
S-traps
Quick vent or sure-vent at Amazon
1-1/2 tubular drain pipe
PVC slip joint Tees at Amazon
PVC slip joint elbow
Washers
Tee
90° elbow
Slip joint extension
T plus 2 thread sealant at Amazon

 'Trap weir' is the final bend in trap as water exits trap Read more
vent under sink Image shows 20 DFU Sure Vent installed under bathroom sink.
Image below shows 20 DUF approved up to 3" pipe
Note the different pieces needed to assemble the vent. Best to buy extra fittings, and a variety of parts.

Whole bathroom requires minimum 3 DFU

3 DFU is enough vent for 1 toilet + 1 sink + 1 tub-or-shower
Kitchen sink requires minimum 1-1/2 - 2 DFU
Washing machine 2 DFU

This sink is at my house and drains into a line that also drains bathtub. The 20 DFU is plenty of vent to prevent slow drainage, gurgling drains and prevent sewer gas from entering home.

Buy: sure-vent air admittance valve:
1 piece vent and tubular adapter
1 piece vent and tubular adapter

Resources:
Oatey 6 DFU vent specification sheet
DFU specification chart
sure vent
6 DUF installed under sink
3 DFU is enough vent for 1 toilet + 1 sink + 1 tub-or-shower ... so the 6 DUF is plenty good for 1/2" tubular drain pipe on sink...
Note the all-in-one Oatey 39225 takes fewer parts and is easier to install than the 20 DUF shown above. Both are in my house, and both serve same number of fixtures.
Tips: Take photo of pipes before starting
Place cushion on floor in front of sink or Wear kneepads
Have another person hand items to you
Buy: sure-vent air admittance valve:
1 piece vent and tubular adapter
1 piece vent and tubular adapter
Kneepads
Installing vent
XX Do not use 1 DFU vent inside wall
Failed ABS black vent will let sewer gas into home
This type vent fails in open position and will let sewer gas into home.
Rated 1 DFU: rated for 1-bowl sink

The 1 DFU vents Fail frequently
A new 1 DFU vent at my home lasted 1 month
The failed vent stuck open and let sewer smell into home.

Previous 1 DFU vents lasted longer, but I replaced all the quick vents in my home with professional grade Oatey 6 and 20 DUF with no problems since.

Resource:
How to make perfect drywall repair

Installation details

New S Trap
Always start by taking apart the trap
Buy 1-1/2" tubular drain parts at local hardware or home center.
1-1/2" is standard code size for kitchen drain, disposal, sink basket etc.


handBuy:  Parts for S trap installation:
Tee
90° elbow
Slip joint extension
1-1/2" trap adapter
buy 12" trap adapter and cut off lengths of 1-1/2" tubular pipe
Sure vent
Oatey sure vent with tubular adapter
Washers
Replacement S-traps if needed
T plus 2 thread sealant

S-trap handInstructions start here
Take apart S-Trap (or P-Trap)
Unscrew 3 nuts, and bottom side of S-trap drops loose, and other side of S-trap lifts up
Put bucket under trap to catch water.
Notice that 1 nut is captive on the S-trap and cannot be removed
This side of S-trap has beveled surface
Notice that captive nut screws down and pushes beveled surface onto 2nd side of S-trap

Notice that all other nuts have a plastic washer ... except captive nut.

All washers and beveled surfaces must be cleaned
This is so each piece fits tight when reassembled
Remove nuts and washers for cleaning
Do not move outlet tee or tailpieces at top
If outlet tee or tailpieces are moved around...
... Then they must be taken apart , cleaned, and put back.

Buy:
Outlet and tee replacement with 2 tailpieces nuts and washers
Tailpiece washer
Dishwasher tailpiece

End outlet assembly with nuts and washers
Clean parts
Clean all washers and nuts
Clean outside of tubular pipe where nut and washer seat
Clean plastic washer/ do not reuse damaged or broken washer
Rubber washer must be replaced with new
Clean threads so nut threads smoothly
Clean beveled surface where beveled washer seats inside pipe
Wash out tubular pipes to remove obstructions

Tube should fit inside other tube at least 1"
Less than 1" can work, but fittings might come loose easier
Longer is better
Measure carefully, and buy extra parts if cut is too short
cut pipe with hack saw How to cut tubular pipe: Plastic or metal
Tubular pipe has a thin wall, unlike water pipe and galvanized pipe that has a thick wall.
So cutting tubular pipe is different.

To make cutting it easy, and straight:
Mark all the way around pipe using marker, or scratch-mark with hacksaw
Cut through pipe at one place using hack saw
Then rotate pipe forward, and cut some more
Rotating forward is better.
Keep rotating pipe as cuts are made
Keep saw blade at angle so it is not cutting perpendicular against pipe


Tip for tubular drain:
Flat side of washer always faces the nut
sink drain Coat washers with T plus 2
Dry fit parts
Position washer in place
Use applicator and apply generous coat that covers entire washer
Protect clothes and belongings from T plus 2... it is messy and difficult to clean off surfaces
If you have rubber washer, old one must be replaced with new washer
T plus 2 will seal the joint 100% on plastic or rubber
Do not use silicone.... joint will never come apart and silicone might mold ...

Rick emailed and disagreed with using T plus 2....
He says:  If the nut will not seal, "loosen & retighten & check for foreign particles &/or a break in the washer.  I check all my seals by filling the sink to the top, then pull the plug.  If I see a drip, I gradually tighten the leaking connection by hand until it stops.  This is so important.  How is the housewife supposed to clear the trap if she can’t remove and reinstall it easily?"

This website says in response ...... the T plus 2 seal will come apart very easily ... it's not like using silicone caulk etc (never use silicone or glue on tubular pipes).
After taking apart tubular drain with the dried T plus 2, just clean the parts like you'd have to do anyway ... and reassemble again with T plus 2 ... and you won't have to tighten and retighten and fuss around trying to get the joint sealed. T plus 2 is first time seal, every time ... and it won't leak later.
Buy:
T plus 2 thread sealant at Amazon
s trap Tighten nuts loosely until all parts are assembled
Wait until all drain parts are together before nuts are fully tightened
sink vent Connect center nut
Tighten all nuts firmly
Then go back and tighten all nuts a bit more
Question about vent not working:
Under sink vent not working.
The new kitchen remodeling put the sink and disposal on an island with no possible way to vent without air admittance valve. 
There is a double sink with 1 P trap and a Tee that connects both sink bowls.
There is 6 DUF AAV vent installed between P-trap and where pipe enters wall.
When I run my disposal, it blows air up out of the other bowl and I get septic smell.
What can I do to fix problem?
Answer
The sink probably shouldn't be on an island, and maybe your experience will help others with similar remodeling plans.
With a double sink, a single P trap is code, but there are other issues.
First of all, the AAVs will respond to air pressure in the line. But does not function like a normal through-the-roof-vent that also allows air to escape the drain line.
Negative pressure (when air is drawn into pipe) and the AAV lets air into the drain line. 

But when the drain is full of water and moving toward the AAV, it pushes a column of air in front of the water, creating positive pressure. The AAV shuts off when there is positive pressure.
The air has nowhere to go ... it cannot push up through an open vent to the roof and get released into atmosphere like normal ... instead the air creates blockage, causing a back up and gurgling into the other sink bowl.

Once the column of water passes the AAV, it will begin draw air into the pipe from the AAV, and the water should be able to flow normally.
If the drain is not letting water flow as quickly as normal vented sink, it can eventually cause line to get blocked with garbage.
Suggestions for island vent not working:
- Experimenting with different behaviors might help.
-If the drain line is not full of water, the AAV works fine.
-So maybe there is too much water being used when the disposal is running. Reduce the water flow.
-Cut up less garbage and increase water flow. It will take longer each time, but long term result will probably be better.
-To make sure all garbage is getting flushed completely out of the line, run water into the drain for a while after each use.

Also consider following actions in this order:
- Blockage: Take apart the tubular plumbing under sink to check if there is constriction.
- Use drain cleaner and run water.
- After repeated drain cleaner, fill both sinks several times and let drain to try and flush out line. Repeat each week.
- Higher level of DUF for the AAV ... use 20 DUF instead of 6 DUF ... might help

- Larger 2" schedule 40  drain and trap up to the point where AAV is located ... this will increase pipe capacity ... then hopefully the drain line and AAV will give better result.

- You don't say it the tubular drain lines are 1-1/2" slip joint typically found in residential construction .... or a larger size 2" schedule 40 PVC drain typically found in commercial installations. The commercial size drain is solvent welded (get one with a clean out) and probably should be a requirement for island installation and might solve problem.
- Install 2" PVC trap and drain instead of using 1-1/2 tubular (likely available at plumbing supply)
- If your kitchen has access from underneath, say from the basement or crawlspace etc, check if the drain line drops straight down into a 3" pipe ... getting the kitchen drain into a larger pipe as soon as possible will improve flow.
Buy:
2" P trap
fixture unitsFixture units
National plumbing code
fixture units
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50 gallon Electric water heaters at Amazon
40 gallon electric water heaters at Amazon
Hybrid / heat pump/ water heaters at Amazon

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How to install gas water heater
How to install electric water heater
Troubleshoot gas water heater
Troubleshoot electric water heater
Point of use water heaters
Resources:
Troubleshoot Gas valves with manuals
Icon gas valve

How to replace water heater element Waste King disposal
How to wire tankless electric


Install point of use water heater
Titan tankless

Contactors/ relays
Type 1 and type 2 surge protection surge protection
Programmable timers

Woods timers
surge protection
Anode rods anode rods
Recirculation system

Tankless recirculation
Point of use water heater
Install and troubleshoot garbage disposal Waste King disposal
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