The extended-body stainless AN16 weld bung. The longer body lets the thread stand proud of thick tank walls, recessed pockets and double-skinned panels, which matters at AN16 because the hose ends are physically large and need genuine spanner clearance. The extra length also distances the 37-degree flare seat from the weld pool, reducing the risk of heat pulling the sealing face out of true. Stainless suits stainless fabrications and any port exposed to heat, moisture or coastal air. Typical uses at this size are coolant and header tank plumbing, breather and vent lines, and dry sump reservoir connections. Weld in staged passes with matching filler.