Thermostatic radiator steam traps are normally open to expel air and condensate and close tightly on saturated steam. They use a forged brass body and a TIG‑welded stainless steel Tunstall Capsule that is calibrated and tested. Rated from vacuum to 25 psi, these traps are available in angle or straight patterns with replaceable stainless steel internals for long service life and energy savings.