Quick coupling

A fast-flow, double shut-off, quick-disconnect coupling for transfer of fluid from a hose on a refilling station or truck to a tank or other bulk container comprising a male nipple member having a generally tubular nipple body extending between a first end for a threaded or other connection to the container and a second end and a normally-closed first valve housed within the nipple body, a female coupler member having a generally tubular coupler body extending between a first end for a threaded or other connection to an end of the hose and a second end configured to coaxially receive the second end of the nipple body for coupling the nipple member to the coupler member, and a normally-closed second valve housed within the coupler body, wherein as the second end of the nipple body is inserted coaxially into the second end of the coupler body to couple to the nipple member to the coupler member, the first and the second valve each is opened to allow for the flow of fluid through the coupling, and further including a sleeve mounted coaxially about the coupler body, the sleeve being slidably moveable over the coupler body to release the nipple member from the coupler member, the sleeve having a flange extending radially outwardly therefrom, and the flange being manually grippable to slidably move the sleeve over the coupler body;

• and wherein the nipple body has an exterior surface, a plurality of circumferentially spaced generally flat wrench surfaces on the exterior surface, and at least one protrusion lug with an aperture extending circumferentially therethrough, the protrusion lug protruding radially outwardly from one of the wrench surfaces for providing a visual cue to locate the lug and aperture to receive a lock wire or other tie through the aperture for tying down the nipple member to the container, and wherein a radially outermost surface of the lug is within an imaginary cylinder defined by radially outermost portions of the wrench surfaces.