the male receiver is typically connected to the casing using a coupling 16 the coupling is an internally threaded cylindrical member one end of the coupling is threaded to the external casing threads the male receiver is then torqued to inner threads on the coupling other end the male receiver is typically a tubular member the male receiver has a first end or mouth 18 for connecting with the quick connector fitting and a second end 20 for threading on the coupling two parallel annular lip protrusions are formed on the outer surface of the male receiver near it first end fig1 a and 1 b the first or upper lip 22 is formed around the mouth of the male receiver the upper lip has an upper surface 19 that slopes downward in a radially outward direction the upper lip also has a lower surface 23 that slopes upward in a radially outward direction the second or lower lip 24 is formed below and spaced apart from the upper lip an annular groove 26 is formed between the two lips the coupling 16 is threaded to the casing 14 the male receiver is then torqued to the coupling the male receiver may be torqued to the coupling using conventional tools such as tongs not shown once the male receiver is torqued in place the quick connector is fitted over the male receiver the quick connector has a.