King Innovation 21155 1 Inch Screw-In King Drains Valve Protectors, Bag of 5

Brand:King Innovation
Manufacturer Part Number:21155              
Designed for 1 inch poly pipe.
First class design that prevents blow-outs by removing residual water and providing protection against early winter freeze and frost.
Pressure sensitive valve that releases water slowly.
Comes with a self-cleaning dirt arrestor screen to prevent future drain clogging.
Ergonomic grip for easy use that is comfortable and slip-free.
Includes patented backflow check designed to prevent contamination of water.
Broad dispensing pad meant to protect against penetration of roots and soil.
Both main and lateral line application.
1" MPT x 1" INS.