Parker PDP Series nipples with compatible couplers provide easy connection for specialised diagnostic equipment or mechanical gauges. These high tensile steel units provide excellent strength and capability to withstand 6000 PSI continuous operating pressure and grip-tight knurled sleeves for making quick connection / disconnection while wearing gloves. They are aligned with the mating couplers via locking balls to eliminate the need for threading and easily snap the test equipment (like gauges, transducers) into place with zero difficulties. These nipples are permanently mounted at the threaded test ports, rigid tubings or hose assemblies and are available in UNF, Seal-Lok, NPTF and Triple-Lok type connections.