GDB33 by Dixon Valve | Boss® Ground Joint | Double Spud | 2-1/2" Size | Wing Nut Thread x Wing Nut Thread | Plated IronFeatures: The spud part of the coupling serves as one half of the Boss Ground Joint connection and is usually fixed to the equipment. The stem part that is clamped to the hose is the other half. The two halves are connected or disconnected by rotating the wing nut on the spud. When connected they achieve both a mechanical, and a pressure seal. Positive metal to polymer seal. Leakproof seal forms when the metal head of the stem makes contact with the