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Does anyone know what kind of steam trap this is, if it is indeed a steam trap? It's on the return side of a radiator from a two-pipe system. The only markings on it are the logo for "P&C Co", which I can't find in any of my steam books. The house was built in 1839 and has a 100+ year old two-pipe steam system. Most of the rads have air vents which I think may have been added sometime in the last 50 years, but I'm not sure. About half of the rads are slow to heat. They're all pretty noisy. I'm thinking I need to consider replacing or refurbishing the "traps" on the returns. Thanks in advance for any knowledge you may share on this.