890-56-04111-16 - Hymax Grip Coupling - 4"Hymax 890 56 04111 16 Hymax Grip Coupling 4" HYMAX GRIP joins and restrains a wide selection of pipes of different types and diameters, easily and reliably. Due to its patented design, it allows the joining of pipes of the same or different materials and diameters, and preventing axial pipe movement. This market leading restraint coupling family, invented and manufactured by Hymax, features a unique radial gripping system suitable for most metal and