National boilers, radiators, and specialties: catalog no. 26 (1920)
National Radiator Company · National Radiator Company · leaf 65
Novus Non-Adjustable Automatic Air Valve with or without Siphon Novus Non-Adjustable Siphon, Automatic Air and Vacuum Valve Non-Adjustable The valve is made entirely of best steam metal and phosphorbronze. Vents to the last molecule of air and keeps it out after being expelled. It is absolutely…
