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Studor 20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve

4.0 out of 5 stars 5 customer reviews

List Price: $51.15
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  • For use with: Venting Single Fixture, Individual Branch, Circuit Vent Or Stack Type Application Up To 500 DFU
  • Material of Construction: ABS Plastic
  • Standards: ASSE Performance Standard 10510 And 1051, NES-592, NSF Standard 14, IAPMO, File No C-3803, ITS Intertek Testing Services
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Frequently Bought Together

  • Studor 20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve
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  • Studor 20346 REDI-VENT Air Admittance Valve, 1-1/2" or 2" PVC Adapter, White
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Total price: $82.97
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Product Description

Product Description

Allow air to enter DWV systems to equalize pressure when water drains out of the system; eliminate the need for costly roof penetrations and vent piping. 1ATD5 vents up to 500 DFUs on a stack; 1ATD6 vents up to 160 DFUs on a branch and up to 24 DFUs on a stack. 15W940 has a replaceable cabon filter to reduce plumbing drainage system odors.

From the Manufacturer

Allow air to enter DWV systems to equalize pressure when water drains out of the system; eliminate the need for costly roof penetrations and vent piping. 1ATD5 vents up to 500 DFUs on a stack; 1ATD6 vents up to 160 DFUs on a branch and up to 24 DFUs on a stack. 15W940 has a replaceable cabon filter to reduce plumbing drainage system odors

Product Information

Technical Details

Part Number GID-301050
Item Weight 8.8 ounces
Product Dimensions 3.5 x 3.5 x 6 inches
Item model number GIDDS-301050
Size 5-1/4 inche
Color wHITE
Material Plastic
Item Package Quantity 1
Batteries Required? No

Additional Information

ASIN B000NID704
Customer Reviews
4.0 out of 5 stars 5 customer reviews

4.0 out of 5 stars
Best Sellers Rank #36,626 in Home Improvements (See top 100)
#22 in Industrial & Scientific > Lab & Scientific Products > Lab Instruments & Equipment > Vacuum & Pump Equipment > Lab Pumps & Accessories > Lab Pump Accessories
#175 in Home Improvement > Building Supplies > HVAC > Registers, Grilles & Vents
Shipping Weight 12.8 ounces (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available September 9, 2006

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Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Customer Reviews

Top Customer Reviews

By Daniel W. Berry on July 23, 2016
Verified Purchase
This is the second one I have installed, and it doesn't work. I wish they did as I don't want to poke another hole in my roof, but it's a crappy solution to venting. This particular model doesn't work as it should at least for me. I had a master plumber tell me during our house construction that Studer valves might work for a short time, but they all fail. I really should have listened more as I think he's right. Just run the vent up and out and be done with vent problems. You can tell if you have a venting problem if your toilet "burps" after flushing.
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Verified Purchase
Product arrived promptly and well-packaged. Although not shown in the stock photo, it comes with a rubber gasket that allows it to fit into a 4" pipe with no air leakage. (For a 3" pipe, the rubber gasket slides off and isn't used.) Solved the problem!
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Very satisfied, solved my odor problem from traps being siphoned out when toilet was flushed. Easier than venting through the roof
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Verified Purchase
did not work on my system well
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Verified Purchase
Works great. Solved a lot of problems
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