The R100 Series of gravity feed reservoirs without flow control are ideal for use as make-up or replenishing reservoirs. They can be installed in most cases to serve both as an oil cup to maintain oil level and as an oil gage to provide 360° visual check of fluid level and condition. Fill cap with side vent minimizes the possibility of dust and dirt entering the reservoir. Reservoirs can be disassembled for occasional cleaning. Some Gravity Feed Reservoirs also come with a low level switch. This low level switch provides a electrical interface to activate a low reservoir level alarm or monitor used to determine when to refill the reservoir. Standard Features - Gravity Feed w/o Flow Control : 1/8, 1/4, 3/8 or 1/2 inch NPTF male connections Available in either break resistant colorless transparent polymer or borosilicate glass for fluid compatibility and thermal shock Standard Features - Gravity Feed with Filter - no Flow Control: 1/4, 3/8, 1/2 NPTF or .625 UNF inch male shank Pipe or bracket mount styles available Standard Features - Gravity Feed with Filter and Low Level Switch: 1/4, 3/8, 1/2 NPTF or .625 UNF inch male shank Pipe or bracket mount styles available DPDT, 10A, 120V, 60Hz relay for switch is available Temperature & Pressure Ratings: Polymer maximum working temperature up to 140°F (60°C) Glass maximum working temperature up to 250°F (121°C) Ratings are at atmospheric pressure.