. Reliable vacuum and vacu-vapor heating equipment . 98 degrees, willcontract the thermal member. This opens pas-sage to return line, allowing all condensation andair to pass out quickly. The steam followingagain expands thermal member, which closes Vacu-Trap. All condensation is removed as fast as itaccumulates, so radiators or coils are always heatedup to steam temperature. The Vacu-Trap insuresthorough draining and quick air liberation at alltimes. The brass knuckle ball joint in Vacu-Trapsupports the thermal member, and, together withbrass ball valve at bottom, always insures positiveseati
. Reliable vacuum and vacu-vapor heating equipment . 98 degrees, willcontract the thermal member. This opens pas-sage to return line, allowing all condensation andair to pass out quickly. The steam followingagain expands thermal member, which closes Vacu-Trap. All condensation is removed as fast as itaccumulates, so radiators or coils are always heatedup to steam temperature. The Vacu-Trap insuresthorough draining and quick air liberation at alltimes. The brass knuckle ball joint in Vacu-Trapsupports the thermal member, and, together withbrass ball valve at bottom, always insures positiveseating, so steam cannot escape. A bronze compen-sating spring prevents vibration of the thermalmember. The Vacu-Traps make every radiator orcoil do its full duty — fully efficient. They arenoiseless, and the most positive-acting and durablereturn line valves made. Note : — The Vacu- Trays are low pressure valves. We do notguarantee them when used where the pressure exceeds 15 pounds. Forty-Seven THE RELIABLE RETURN LINE COMPARISON OF THE VACU-TRAPS. No. 2 Flushing Vacu-Trap With Key Made in 3^> M a°d 1 inch sizes The Little Wonder and No. 1 Vacu-Trapsare identical, in style of construction and oper-ation, except that the Little Wonder Vacu-Trapis smaller. The No. 2 Vacu-Trap is a flushing trap, andno change of valves or piping is necessary for clean-ing the system. The knuckle ball joint at top ofthermal member fits into a socket in a bronze cross-bar. This crossbar rests on a shoulder in the body,and is held in place by a heavy phosphor bronzespring. A key is furnished with No. 2 FlushingVacu-Traps, which, when inserted at top andturned by hand, raises crossbar and thermal mem-ber against the spring pressure enough to permitsteam to blow freely through valve across the seat,cleaning radiation and Vacu-Traps thoroughlyof all foreign matter, through a bypass to is accomplished without interfering withoperation of the heating system. After cleaning key Forty-Ei
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