Description Description The Haskel 50881 seal kit is a replacement part for the control valve of the Haskel 8AGT-5/30 gas booster. The seal kit contains high-quality seals that ensure optimal performance and durability of the gas booster. The seal kit is easy to install and comes with detailed instructions. The Haskel 50881 seal kit is compatible with the 50899-1 and 50899-2 cycling valves. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories