3/4" 765 PRESSURE VACUUM BREAKER (PVB) ASSEMBLY WITH BOTH INLET AND OUTLET BALL VALVES. THESE NOW COME WITH A FREEZE SENSOR ADAPTER ADAPTER THAT WILL WORK WITH AN ADD-ON KIT THAT MUST BE PURCHASED SEPARTELY. THE ASSEMBLY WILL FUNCTION WITH OUT THE SENSOR ADAPTER OR KIT. IF INTERESTED IN THE ADD ON KIT CONTACT US.