Amazon.com: SUS SS 316 Stainless Steel Tri Clamp Set 2Pcs 19MM 3/4" 0.75" OD Sanitary Weld Ferrule + 1.5" Tri Clamp + 1.5" PTFE Gasket : Industrial & Scientific
Amazon.com : NRC&XRC Deck DEO 2IN(50mm) Fill/Filler2with Key Cap New Casting Boat Marine Grade316 SS Hardware for Boat Yacht Caravan,RV : Sports & Outdoors
Amazon.com : NRC&XRC 1-1/2"(38mm) Boat Water Deck Fill/Filler with Keyless Cap Marine 316 Stainless Steel Hardware for Boat Yacht Caravan : Sports & Outdoors