Shurflo In-Line Check Valve - 1/2" BarbThe 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: 1/2" Barb [13mm];