Features:
Retainer ring molded into each fitting prevents the sealing gasket from expanding or sliding out of position under compression. 
Bearing washer insures even compression on the gasket and promotes sealing.
Each fitting features left hand compression threads to prevent loosening while installing mating fittings.
Internal threads feature female pipe threads and are provided on both sides of the fitting - mating fittings can be installed on both sides of the installed fitting.
Sealing gaskets are produced from durable Santoprene thermoplastic rubber (TPR).
Fitting compression nuts feature a specially designed cross-section to prevent distortion under load.