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Has anyone seen threads like this on old steam systems? I've been in the trade for 45 years and this is new to me. Look at the pic - it is a shallow fine thread like on a lav pop-up tail piece, but is tapered. I have laid a standard thread next to it for reference. Regular 1" and 1-1/4" radiator valves are screwed onto these threads with little damage. I needed to extended the riser due to a higher floor and planned on using an extension piece. You all know what kind of job I got into replacing the riser. I was able to screw the old valve onto a regular pipe thread. Why the fine thread? The other end of the riser has a standard thread. This one pipe system is probably approaching a century of service.
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