Plastic check valve. Direct OEM replacement is made of high quality plastic. Factory tested for zero leakage. Made in USA. Direct OEM replacementGuaranteed not to yellowCheck Valve with 1/2" Male Pipe ThreadIncludes installation kitImpact & Road Salt ResistantCut Out Dimension 3-1/2" diameterOutside Dimension 4-3/4" diameterDish Depth: 3/4"Valve Depth: 3"IAPMO, NSF & CSA Certified