This kit includes an Under-body Coating Gun and a can of Schutz Underseal - Perfect to be used after welding the underside, keep the original looks as well as protect your car from the muck of the UK weather! The Wax / Shutz Underbody Coating Gun simply screws onto a standard tin of under-body coating material and creates a venturi action that sucks up the material and pushes it through the gun nozzle. Comes complete with plastic spray nozzle and extension pipe for getting right into cavities or difficult to reach areas. 1/4 BSP Female Bayonet is available here .