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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 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 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 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 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 |
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Keep septic smell, and
flammable methane gas out of
house Add
a vent to keep septic smell out of houseAnd 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. |
 Home
must have at least one 3-4"
main 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 |
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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 |
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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 |
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... 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.  Buy: 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
ventOatey sure vent with tubular adapter Oatey 39225 Washers Replacement S-traps if needed T plus 2 thread sealant P-traps and trap adapter  InstructionsUse 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 When 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 |
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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
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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 |
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 Larger 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 |
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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 |
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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  |
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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 |
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| Installation details | ||||||
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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. Buy: 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
ventOatey sure vent with tubular adapter Washers Replacement S-traps if needed T plus 2 thread sealant |
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Instructions 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 |
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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 |
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Clean
partsClean 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 |
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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 |
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Tip for tubular drain:
Flat side of washer always faces the nut |
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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 |
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Tighten nuts loosely until all parts are assembled
Wait until all drain parts are together before nuts are fully tightened |
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Connect center nut
Tighten all nuts firmly Then go back and tighten all nuts a bit more |
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| 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 |
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