Sentinel Drain Guard Backflow Preventer with black cylindrical body and flat top featuring multiple cutouts and two white sealing rings, shown from a front angle. CSA-approved valve fits 3-inch and 4-inch floor drains to prevent basement sewage backflow. Holmes Approved Products logo below.
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Sentinel Drain Guard Backflow Preventer

Rollbacks & more
ShopShop
Current price is $29.98
Price when purchased online
Free delivery over $35, arrives by Fri, Jun 19 to
Sold and shipped by Walmart
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