See all products of Accessories for zone/diverter ball valves By-pass tee. Shell insulation for motorised ball zone valves 6453 series with by-pass tee 6459 and 6490 series. Insulation kit for use in heating and cooling systems. Insulation kit for use in heating and cooling systems. Insulation kit for use in heating and air-conditioning systems. Spare actuator for motorised ball zone valves 6452 and 6453 series.