Description GAUGES ANALOG Gauges feature an easily readable and highly visible, red Day-glo® needle. High strength steel bourdon tube ensures high cycle life. Stainless steel cases and lens locking rings. 4" and 6" (101,6 mm and 152,4 mm) dry gauges can be filled with silicone (Kit #9046). Have 1/4" NPT connections. Calibratible gauge. ADAPTER FITTING Tee adapter. For installing gauge between pump and hose coupling. Has 1/4" and 3/8" NPTF female and 3/8" NPTF male ports. 10,000 psi (700 bar) fittings for all applications.