Connection to: heating circuit, With expansion vessel connection: no, With automatic venting: no, With filling and draining tap: no, With pressure gauge: no, With check valve: no, With safety valve: no, With thermometer: no, With circulation pump: no, With thermal insulation: yes, Connection distributor for the hydraulic connection of two pump assemblies compact installations WPKI- HK and WPKI- HKM Connection: G 1 1/2'