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National boilers, radiators, and specialties: catalog no. 26 (1920)

National Radiator Company · National Radiator Company · leaf 66

An illustration from National boilers, radiators, and specialties: catalog no. 26, 1920, leaf 66 — No. 1 The No. 1 Hoffman Siphon Air Valve is made for the perfect venting ofair in steam radiators. It has no expansion post, is non-adjustable and oper-atively perfect.List price, each $1 QQ The No. 2 Hoffman Siphon Air and Vacuum Valve is absolutely auto-matic and requires no adjustment at any…

Boilers · Radiators · Water-tube boilers · Steam boilers · Radiant heating units

Internet Archive · Building Technology Heritage Library · Public Domain Mark 1.0. Free to use for anything.

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