Tri Clover, Tri Clamp Cap - 4". NorCal Brewing Solutions
Amazon.com: DERNORD Tri-clamp Stainless Steel 304 Single Pin Heavy Duty Tri Clamp with Wing Nut for Ferrule TC with 1 pc Silicone Gasket (2" Tri-clamp+Silicone Gasket) (2 Inch Tri clamp Size: 1