Used to test static pressure in fire hose or fire hose nozzles. They are also designed and intended for standpipe use. NOT intended to flow test fire hydrants. Specifications: Aluminum 2½" F swivel NST x 2½" M NST Download Spec SheetTabsPart Finder Result SKU: LINEGAUGE25-ST Part Table 1 Items Part LINEGAUGE25-STLINEGAUGE25-ST