Our Diaphragms are a direct fit for your CAT H120ES.
Big Hammer Co is an aftermarket manufacturer for all the brands we sell. Big Hammer Co is not endorsed or sponsored by, or in any way associated with CAT. This product is an aftermarket part.
Any use of or reference to the CAT trademark is for the sole purpose of indicating compatibility or product fit, and is not meant to imply any affiliation or relationship between Big Hammer Co and CAT and/or the CAT Trademark.