This radiator steam trap replacement kit is used to repair old or obsolete radiator steam traps without the cost of replacing the steam trap body or performing expensive repiping. It consists of a replacement air vent for float and thermostatic traps. It can be used to easily fix 3/4 inch air vents for F & T traps at 15 and 30 psi, Trane model 686 and 55AL for 3/4 - 2 inch sizes.