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Use of Viega Propress Baseboard Stiffener

rossn Member Posts: 22
I purchased a few of the Viega Propress stiffeners that are intended for use with the thinner-walled baseboard copper.

However... they don't slip in! Instead, it looks like the OD is just a tad bit large for the ID of the radiator tubing.

The radiator tubing measures at 0.875 OD, with about a 0.018 wall thickness.

Should I need a mallet to tap it into the radiator tubing (not my first inclination) , or do I have another issue going on?


  • Intplm.
    Intplm. Member Posts: 1,336
    I have soldered all baseboards mostly because of the tight spaces that a propress jaws would not fit into.
    That being said. You do need to tap the stiffeners into the thin wall copper tubing.
    Ream the tubing before you start.
  • STEVEusaPA
    STEVEusaPA Member Posts: 5,319
    Or solder on tail pieces so you can press where it's easier/more convenient.
  • mattmia2
    mattmia2 Member Posts: 3,990
    I found soldered on propex fittings to be great for this application.