Boss® wing nut caps include a 12 in. long chain and washer. Use with Boss® washer seal style spuds. Wing nut caps are not intended for pressure applications. Size is for 3/4 in. & 1 in. (19.05 and 25.4 mm) wing nuts. It has a 1-1/2 in. NPSM thread. Includes washer. Made of 316 stainless steel.
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RB12SC Dimensions (PDF Download)