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Island sink gurgling water Under sink vent not working. E-mail: geno03245w@gmail.com Kitchen sink requires minimum 2 DFU Washing machine 2 DFU 3 DFU is enough vent for 1 toilet + 1 sink + 1 tub-or-shower How to to install VENT under sink |
| Question about vent not working: Island sink gurgling water 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 (AAV). 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 (air admittance valve) 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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 |  Oatey sure vent 6 DFU approved for drains up to 2" diameter All in one vent for under sink Approved to drain pipes up to 2" Buy: sure-vent air admittance valve: 1 piece vent and tubular adapter 1 piece vent and tubular adapter Oatey 39225 |
 Larger image... Add sure-vent to P-trap P-trap goes through wall Oatey meets code requirement: Minimum 4" space between horizontal pipe and vent Oatey 3925 rated 6 DFU/ Oatey 6 DFU vent specification sheet Vent must be located at least 2 pipe diameters away from trap weir 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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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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