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The product is a set of 10 Parker PD361 test port quick coupling nipples in male design. Parker PD361 Test Fitting
PD Series Nipple, Steel, 1/8\" Body Size, #6 SAE (9/16-18 ORB) Male Port, Non-Spill, Test Port, 6000PSI (414Bar) Working Pressure, Nitrile Seals, Temp Range Degrees F: (-40 to +250), Same As John Deere AH12576, Caterpillar 6V3965