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20 DFU Sure-Vent Air Admittance Valve w/ 1-1/2" x 2" PVC Adapter
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MANUALS (2)
Product Highlights
Description
Specs
| Size: | 1-1/2" 2" 1-1/2" x 2" |
|---|---|
| Material: | PVC |
| Capacity: | 20 DFU |
Questions?
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Product Q&A
6 QuestionsQ: What does the "20 DFU" mean in the description? This is basically a vacuum breaker; correct?
Asked by Tuna 10 years ago
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Verified Reply- SupplyHouse StaffAccording to Oatey, "an air admittance valve's ability to breathe is measured in Drainage Fixture Units or DFUs. The higher the DFU rating on the valve, the greater amount of air that can enter the DWV system. DFU loads are assigned to plumbing fixtures dependent on the volume rate of discharge, the duration of operation and the time between operations."
Yes, it is typically used when a conventional "vent" is not practical or possible. We see them many times under the counters in mobile homes and travel trailers. They may not be code for new construction in conventionally built homes & buildings. Check with your local building department if it may come into question. The catalog number may not be relevant to it's function or description.
Q: Can I install these onto the tops of my existing sewer vent stacks? They have bad sewer smell coming out of them.
Asked by Rooster 11 years ago
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Your vent stacks are supposed to allow sewer gas (the bad smell) to vent into the atmosphere. Typically the stacks open to the air on the roof, where no one is affected by the smell. These remain closed until a vacuum is created by a drain taking water. These are not intended for the purpose you suggest.
Q: can this be used to replace the vent pit for the bathroom sink in a mobil home?
Asked by Gerald 11 years ago
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Mobile homes and RV's are where these are used most. Many building codes won't allow there use in new construction in lieu of a regular vent pipe. Most of these need to be mounted upright, vertical.
Q: Our toilet started making a deep blurp sound (go ahead and laugh). We had the home built less than 5 years ago. We had a plumber come out. He took out a part just like this vent air admittance valve and told us that was the problem and that the part was going to be $900. I see that clearly he is trying to take advantage of us based on your prices. Is it costly to install this part?
Asked by LucyLou 11 years ago
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No, it is a pretty straight forward replacement, cut the old one off or unscrew it, glue or screw on a new one. I would think this should be covered in the cost of a service call. Looking at this I'd say that the plumbing wasn't properly vented when the house was built. We see these most often in mobile homes or other manufactured housing. Some code jurisdictions don't aloow them in lieu of conventional venting.
Q: I have an existing drain vent going from a shower drain, in a crawl space, through a vertical wall to the roof. I am moving the wall and would prefer to not re-rout the vent. If I use this vent valve in the crawl space, will sewer gas be emitted into this closed (crawl)space? I don't want to be working in the crawlspace with sewer fumes and lowered oxygen levels.
Asked by James 12 years ago
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The vent cap is used to relieve the vacuum allowing air to enter the vent and allow the water to go down the drain. At the same time it prevents sewer gas from escaping from the vent pipe. If ever you smell sewer gas, replace the cap. Note, not all jurisdictions allow the use of these caps in lieu of a vented vent.
Q: can this product be used as an air inlet vent on a pressurized water system? Can it withstand say 90 psi?
Asked by tom 12 years ago
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Verified Reply- SupplyHouse StaffThis valve is for use on unpressurized drainage lines.