Steam Trap Cross Reference: Spirax Sarco, Armstrong, Hoffman, Watson McDaniel, Nicholson & TLV

Steam traps are one of the few product categories where nearly every manufacturer makes a functionally interchangeable equivalent — if you match three things: trap type, connection size and pattern, and pressure rating. This cross-reference covers the four common families — thermostatic, float & thermostatic, inverted bucket, and thermodynamic disc traps — across Spirax Sarco, Armstrong, Hoffman, Watson McDaniel, Nicholson, Spence, and TLV.

Two selection rules before you use the tables. First, face-to-face dimension matters on in-line replacements: an equivalent trap that’s half an inch longer doesn’t fit existing piping, so we’ve kept the F/F dimensions in the tables where the sources provide them. Second, a brand cross is not a capacity calculation — condensate load and differential pressure determine the correct trap size, and the interchange assumes you’re replacing a correctly sized trap like-for-like. If the original was mis-sized, cross-referencing it faithfully reproduces the mistake.

Find your existing trap by manufacturer and model in the tables below, read across for equivalents, and check the size/pressure columns against your nameplate.

TCI Supply stocks Spirax Sarco and sources across all the brands listed. Send us the model off your failed trap — a photo of the nameplate works — and we’ll confirm the interchange and quote same-day where stock allows.