Description Description The Haskel 28303 check valve is a high-performance valve designed for fluid and gas applications. It features a stainless steel body and seat, a spring-loaded poppet, and a Viton O-ring seal. The valve has a maximum working pressure of 6000 psi and a cracking pressure of 5 psi. The valve is suitable for use in hydraulic systems, pneumatic systems, chemical injection systems, and other demanding applications. The Haskel 28303 check valve is easy to install and maintain, and offers reliable and consistent performance. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories