[GMB]

There are loads of valve equivalent lists around, i.e. different numbers for either the exact same thing or something close.

I have noticed people making comments like XXXX valve was effectively the same as the old YYYY valve but in a modern envelope.

But does anyone know of lists of valves that are not plug-compatible but are effectively the same thing?

As much older valves become scarce, it would be useful to know that one can substitute it using a particular "modern" valve using a suitable adapter.

Are there also lists of the exact same valve but with a different heater? Sometimes this is easy to guess - but not always.