SafeWay's S51 Series is a heavy-duty, double shutoff quick coupling capable of containing a variety of fluids. The S51 Series is ideally suited for use on dump trailers in the connection of the wet-line hydraulic system. This interchange is also widely used on oil field equipment and anywhere that connection under pressure with little or no spillage is required.

The S51 Series is available in two materials. A brass body with a cast steel wingnut or a machined steel hex nut or a nickel plated steel body (-STL) with a cast steel wingnut or a machined steel hex nut.