Diaphragm operated Solenoid/Strainer combo units.
442P & 443P are brass construction.
P442 & P443 are celcon plastic construction.

Used for controlling the flow of water, air, oil and various other (except hazardous) chemicals � Temperatures to 200 Deg. F. maximum � Standard with molded waterproof coil � Mount in any position except with the coil under the valve � Electrical junction box � Stainless steel seat � Pilot operation which are direct acting.