Long Stainless Nipples We stock the largest array of nipple lengths 18″, 24″, 36″, and 48″ lengths are stocked in addition to the standard stainless steel nipples. Large Diameter Stainless Nipples We have stock ready for same day shipping in stainless steel nipples in nominal pipe sizes 5″, 6″, 8″. Contact us for all of your nipple needs