Viking Johnson Ultragrip Restraint Couplers are suitable for all pipe materials.
Viking Johnson Aquafast Couplers and Flange Adaptors are suitable for polyethylene and some series(white) PVC pipe.
Viking Johnson Maxifit and Maxiadaptor range of products are designed to accommodate plain ended pipes with different outside diameters, thus reducing stocks.
Viking Johnson Ultragrip Restraint Couplers are suitable for all pipe materials.