Shurflo In-Line Check Valve - 12 Barb The Shurflo In-Line Check Valve allows water to flow in only one direction helping to safeguard against back surge pressure up to 100 PSI. Its small size allows for quick and easy installation. Features Allows flow in one direction only Safeguards against back surge up to 100 PSI Small size, easy installation Specifications Port Size 12 Barb 13mm California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type