This is a type of check valve correct? The ability to take the lid off serves what purpose? Could you run a snake down the line with the top off?

Taking the lid off allows you to clear debris out of the valve. Yes--you get full access to the line from the top of the valve. I use it to drain a yard that floods during high tide. Works well.

Can this valve be used under ground?

Yes, our Backwater valves can be used underground. You can also install an access sleeve (straight piece of pipe) in order to service the valve at the surface.

I received this valve and it came with a seal for the flapper. However, the seal will not stay in the grove on the flapper. Any suggestions?

Hi. It comes with 2 O rings, one is for the flapper, add some syllicon glue, like the used on motor engines, this backwater works really good,

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Oatey 4 in. PVC Backwater Valve

Product ID: 309634527

Details

Material
PVC
Brand
Oatey
Item dimensions L x W x H
30.5 x 22.9 x
Inlet connection size
4 Inches
Inlet connection type
threaded

🔄quick-action elastomeric flapper seal

🔧hand-tightened neoprene-sealed access cap

🛡️4-inch robust PVC build

$150.02

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Description

🛠️ Stay ahead of backflow—secure your space with smart, effortless protection!

TOOL FREE MAINTENANCE - Threaded access cap with neoprene seal allows quick, hand-tightened inspections and cleaning.
LIGHTWEIGHT YET DURABLE - Crafted from premium PVC, combining strength with easy installation and long-lasting performance.
SEAMLESS SEAL TECHNOLOGY - Elastomeric flapper ensures instant, watertight protection every time.
ULTIMATE BACKFLOW DEFENSE - Protects your property from costly sewer backflow with a reliable 4-inch valve.
VERSATILE PIPE COMPATIBILITY - Fits DWV pipes and adapts easily for sewer and drain systems—flexibility that fits your needs.

The 4-inch PVC Backwater Valve by Oatey is engineered to prevent sewer backflow in low-lying areas. Featuring a quick-action elastomeric flapper for a watertight seal and a hand-tightened neoprene-sealed access cap, it offers easy maintenance without tools. Designed to fit DWV pipes and adaptable for sewer and drain systems, this lightweight yet durable valve ensures reliable, long-term protection for your property.

Specifications

Manufacturer	Oatey
Part number	43904
Item Weight	1.93 Kilograms
Product Dimensions	30.48 x 22.86 x 20.32 cm; 1.93 kg
Item model number	43904
Size	4 Inch
Color	White
Style	Flapper
Material	PVC
Shape	Other
Item Package Quantity	1
Measurement System	Imperial
Specification met	DWV
Included components	Backwater Valve
Batteries Included?	No
Batteries Required?	No

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$150.02

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to British Virgin Islands.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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