The Xylem-Bell & Gossett 118036 Strainer & Gasket Kit is a maintenance kit designed to protect HVAC hydronic systems by filtering debris from circulating water. It works by capturing dirt, rust, and sediment inside the strainer while the gasket ensures a tight, leak-free seal during operation. This kit is commonly used in Bell & Gossett pumps, boilers, chillers, and other commercial HVAC water circulation equipment to maintain clean fluid flow.