The RDF Series of drop feed reservoirs feature a vented sight chamber, adjustable metering and toggle shut-off. Fill cap with side vent minimizes the possibility of dust and dirt entering the reservoir. Reservoirs can be disassembled for occasional cleaning. Maximum viscosity 1500 SSU. Standard Features: For reservoirs intended for direct mounting, outlet connections are dependent on reservoir capacity and are male 1/8, 3/8, 1/4 or 1/2 inch NPTF pipe threads For reservoirs intended for remote/panel mounting, a threaded stud with lock nut is provided with an integral female 1/8 inch NPTF outlet connection. The thread size of the stud is dependent on reservoir capacity and is either 9/16-18 or 5/8-18 straight thread. Temperature & Pressure Ratings: Polymer up to 140° F (60° C) Glass up to 250° F (121° C) Ratings are at atmospheric pressure