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Threads on rods

Postby Grandad99 » Sun Jun 07, 2020 4:15 pm

I have 2 sets of drain/chimney rods, ages around 40 and 80 years (I bought one set then inherited dad's). I discovered when trying to extend one set that they have slightly different threads.

Trying to clear a blockage recently the "corkscrew" attachment came off. A Home Serve plumber jetted the blockage so the lost attachment is somewhere further along the system. I've bought a replacement but it does not match the thread on either set of rods.

Does anyone know the details of the 3 thread sizes?
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