National boilers, radiators, and specialties: catalog no26 . 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 price, each $1 QQ The No. 2 Hoffman Siphon Air and Vacuum Valve is absolutely auto-matic and requires no adjustment at any time. It is air, steam and watertight and functions price, each. ^ 5Q The No. 3 Hoffman Air Line Valve is for drip orvacuum. It vents the last vestige of air but automatic-ally closes against price, each $2 50 The No.

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National boilers, radiators, and specialties: catalog no26 . 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 price, each $1 QQ The No. 2 Hoffman Siphon Air and Vacuum Valve is absolutely auto-matic and requires no adjustment at any time. It is air, steam and watertight and functions price, each. ^ 5Q The No. 3 Hoffman Air Line Valve is for drip orvacuum. It vents the last vestige of air but automatic-ally closes against price, each $2 50 The No. 4 Hoffman Junior Quick Vent Air Valve isautomatic and non-adjustable. It is a dependable valveand keeps mains and risers free from air. It does notclose against price, each . $2 80 The No. 5 Hoffman Quick Vent Float Air Valve is a perfect venting devicefor blast coils or vent stacks. It is open for air passage but closed tight againststeam or price, each $8_0Q The No. 6 Hoffman Quick Vent Float Air and VacuumValve is intended for qui

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Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1920, booksubjectsteambo, bookyear1920