Plastic aka polypropylene or poly camlock fittings are available from 3/4 to 4 inches on the basic standard cam & groove couplers type A, B, C, D and E. Our Made in the USA poly camlocks (cam and groove) couplings are made from a glass filled composite making our fittings stronger and tougher. Polypropylene fittings the first choice among several industries for food application, chemical and sanitary.