phil wrote:
Are 'old' and new drain rod sets usually compatible in terms of the
screw fittings?

I ask because I have a set of (orange) propylene drain rods which
aren't quite long enough for my drains so I was going to buy a new set
to add to the length. This existing set is possibly 10 or so years old
(at a rough guess).

Thanks

Take one with you when you go to buy the new ones.