This A-A-59326-compliant 316 stainless steel dust cap has a female coupler connection with a 1 1/2-inch coupling size. The coupling component is a socket with a DC coupling type and has a socket inside diameter of 2 1/8 inches. This dust cap can be used in citric acid, fuel, hydraulic fluid, and general-purpose applications. Its working temperature is 0 Degrees F to 200 Degrees F, with a maximum operating pressure of 250 PSI.