Cylinder Protection Add to quote to select, and choose quantity on the quote form. “Fine Thread Cylinder Cap – 3 1/8″ x 11 Thread” has been added to your cart. View cart Grid view List view 100 lb LP Acetylene Collar CLPCO1Add to cart Add to Quote Coarse Thread Cylinder Cap – 3 1/8″ x 7 Thread HPCAPCOARSE HP Course Cylinder Cap 3 1/8″ x 7 Thread Add to cart Add to Quote Cylinder Construction Collar CONSTCOLLAR 100LB Construction Collar Add to cart Add to Quote Fine Thread Cylinder Cap – 3 1/8″ x 11 Thread CAP-HPF-SC HP Fine Cylinder Cap 3 1/8″ x 11 Thread Add to cart Add to Quote Threaded Collar with Cap TCCAdd to cart Add to Quote