Sanitary weld on ferrule, 2" tri clamp/tri clover fitting, stainless steel 304 tri clamp/tri clover compatible ferrules are designed to be welded onto pipe, sanitary tubing, or directly onto a vessel of your choosing to provide you with a sanitary tri clamp connection. Our ferrules are manufactured from 304 food grade stainless steel, and meet all of todays sanitary standards for sanitary fittings. These ferrules measure 1-1/8" long.