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I bought a few of these on Ebay NOS. They appear to be from the 80’s. I have an old one from a junk lot that could be from the 50’s. Both vents are identical. Very slow rate similar to a 1933 I think except this vent is significantly larger and retained a copper siphon tube. What is the difference between this no 3 and a 1933? And when did they start making these? They have a very art deco looking appearance similar to a hoffman 1.
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1983(?) Peerless G-561-W-S | 3" drop header, CG400-1090, VXT-24
I had thought that the faceted style was an older design, before the company was bought by Eaton, but since your vents are faceted, and the boxes say Eaton, I'm not so sure now.
1983(?) Peerless G-561-W-S | 3" drop header, CG400-1090, VXT-24