National boilers, radiators, and specialties: catalog no. 26 (1920)
National Radiator Company · National Radiator Company · leaf 66
vacuum, List price, each «j2 00 No. 6 67 NATIONAL HEATING SPECIALTIES Hoffman Return Line Valve The Hoffman Return Line Valve is an efficient, reliable and dependableradiator trap; a thermostatic valve that is absolutely automatic and non-adjustable and operative under vacuum or plus pressures…
