This water bottle boss is 3/8" OD x 5/16" long and is drilled and tapped M5 x 0.8. There is a 1/4" diameter stem that fits into a hole drilled into the frame tubing. The flange on the outside diameter provides the material for a fusion weld so a filler rod is not required to make the weld. Made from 304 stainless steel, it can be welded or soldered onto a frame.
Please note: a line engraved on this part identifies it as stainless steel.
Item sold individually.