Rolair 300 PSI Air Compressor Gauge GA250300GC Side Mount Replacement Piece 1/4" Brand new replacement air pressure gauge. This gauge is an OEM replacement for Rolair air compressors, part number GA0250300GC. This gauge has a 2" diameter face and 1/4" male NPT threads. This is a side/bottom mount gauge. This is a quality replacement gauge that measures up to 300 PSI. This gauge fits a variety of Rolair compressors as well as other brands! Please see below for more features and specifications. Features and Specifications Measures Up To 300 PSI 2" Diameter Readable Face 1/4" Male NPT Thread For Connection To Compressor OEM Replacement For Rolair Air Compressors Mounts On Side Or Bottom Of Compressor