Founded in 1933, Hirsch Pipe & Supply operates a wholesale plumbing and HVAC distribution branch on Commercial Street in La Mesa as part of a 30-location Southern California network. The 25,000-plus line-item inventory supplies water heaters, gas piping, copper fittings, and PEX manifold systems to licensed plumbers, including the residential re-piping crews at Earl W Fite & Sons Plumbing Inc. Counter sales and same-day delivery service the trade-contractor pipeline across San Diego County, stocking brands from A.O. Smith water heaters to Hydro Systems soaking tubs. HVAC supply lines carry furnace components, refrigerant fittings, and ductwork hardware for heating and cooling contractors such as Reitz Heating & Air, Inc. who pull parts for residential change-outs in La Mesa's 91942 corridor. The highest-specification inventory tier includes commercial boiler components, backflow-preventer assemblies, and large-diameter copper DWV fittings sized for multi-story and institutional plumbing systems.