Forum Discussion

Almot's avatar
Almot
Explorer III
Nov 29, 2018

Changeover regulator - no thread to mount

Have bought this Marshall Excelsior automatic changeover. Works perfect. One problem - mounting holes at the back have no thread.

I am past return window, a piece of wire and duct tape holds it so far. It "looks" like made for #8 screws. Old worn-out #8 falls right in, new #8 won't go at all - so this must be it. So... buy #8-32 tap and just do it?

Btw, what is the difference of this Marshall from slightly higher priced Marshall Excela-Flo 253P and 253LP? https://www.walmart.com/search/?query=changeover%20regulator%20megr%20253

Also... See that black plastic cap - it says "do not remove". The cap is sitting there pretty loose, I'm thinking to put a drop of some goo under, before I lose it.
  • Almot's avatar
    Almot
    Explorer III
    They are pre-drilled, yes. Not threaded.

    Self-tapping screws will probably cut so-so threads, not as good a tap.

    So, 8-24? not 8-32?
  • Look on the back of the regulator. It should have 6 or so screw holes pre-drilled. Go to local hardware store and get self-tapping screws(I think they are #8x24s). Not sheet meatal screws!

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,194 PostsLatest Activity: Jan 29, 2025