Schlüter-BEKOTEC-THERM-KH is a convenient set for flat seal connection to a Schlüter heating circuit distributor. Each set contains two ball valves made of nickel plated brass and feature a 1″ (DN 25) external thread on one side and either a 3/4″ (DN 20) or 1" (DN 25) internal thread on the other side. Note: Part of the Schluter Bekotec System to be used only with the appropriate Bekotec components