Buderus compression fittings are normally secured to the piping connection on the radiator. When a diverter or shutoff valve are used, the compression fittings mount on the valve.
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Q:will these work with 3/4" Wirsbo PEX-AL
A:no pex al pex will only work with pex-al-pex fittings.
Q:Can these fittings be used with the pro pex expander system?
A:No, these fittings are compression. The Pro Pex Expander system can only be used with expander fittings, as well as the expander rings, and expander tool.