Description Description The Haskel 28081-1 ring is a high-quality insert check seat that is compatible with the HAA31-2.5-N gas booster. This spare part is designed to ensure optimal performance and reliability of your gas booster in various applications. The Haskel 28081-1 ring is made of durable material that can withstand high pressure and temperature. Whether you need to replace a worn or damaged ring or keep a spare one handy, the Haskel 28081-1 ring is the right choice for your gas booster. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories