Valterra 3 Piece Pneumatic Gate Valve [2" Slip x 2" Slip] [30 PSI] (9201) gptools Supports cleaner and more convenient Supports cleaner and more convenient water management A door assembly is useful because it helps protect internal components while preserving the finished appearance and service access of the heater cabinet The 30 PSI rating and slip by slip configuration make it a practical fit for supported line layouts that need dependable valve control A valve in this style is useful because it gives the system a dedicated control point while the 3 piece construction can make service and replacement more manageable than one piece designs