Conforms to International Standards Connects to Probe and Screw quayside fittings O ring in housing ensures good seal to probe Marine quality 316 Stainless Steel Standard 16mm (5/8 inch) hexagon cap key Easily replacable O ring For 38mm (11/2”) 50mm (2”) or 63mm (21/2”) hose Hole Dia. 65mm Flange Dia. 100mm