T&S faucets have tapered pipe threads. Made mistake of buying a cheaper brand elbow. It had straight threads on nipple which resulted in leaks. (Some brands of faucets are designed for straight threads which leads to confusion as descriptions can be confusing.) Did some research and found the T&S brand elbow has tapered threads like the T&S faucet. Bought this one and no more leaks. This is the one to buy for the T&S faucet for use on a commercial sink mounted against the wall.