Installing a JOES Expansion Tank will help keep your engine cool!. a 1/4" NPT fitting is welded in at the top for an air bleed line, a 1/2" pipe fitting for a line to your water pump is near the bottom and an 1/8" fitting for water overflow is provided in the 6061-T6 billet aluminum filler cap housing. Fabricated from 5052 aluminum. 1-3/4" tube mount clamp.Pit Stop USA offers JOES Expansion Tank - 1-3/4" Tube Mount 45004 at low everyday prices. Be sure to check out all of our products from Joes Racing Products including Joes Racing Products Overflow and Expansion Tanks.