I need to build an adapter for this connector, however, I wasn't able to identify it. I measured it with a digital caliper. It doesn't seem to be a common connector, at least in Germany.

Can you identify this connector? I have two adapters that use this connector, a brake bleeder and a coolant leak tester.

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  • Does it unscrew? If so do that and make an adapter for the threaded hole instead.
    – Moab
    Commented Feb 24, 2020 at 11:57
  • Does not appear to be a standard german quick coupler>>>>air-pneumatic-fittings.com/Europe%20Type%20Quick%20Couplers/…
    – Moab
    Commented Feb 24, 2020 at 12:02
  • I also had that idea & tried to unscrew it, but it's too tight, probably glued in for sealing. It's also not my adapter, so I don't want to mess it up or modify it. Commented Feb 24, 2020 at 12:15
  • 1
    Its probably a custom coupler manufactured by the company that made the tool.
    – Moab
    Commented Feb 24, 2020 at 12:25
  • Its a pipe thread so it will be tight, I would use an air impact wrench to remove it but understand it is not yours.
    – Moab
    Commented Feb 24, 2020 at 12:27

1 Answer 1


I couldn't find this connector type, so I "sacrificed" the coolant adapter to build an adapter. Now I can either use the brake bleeder with this proprietary connector or use a standard (NW 7,2) connector.

I'll attach a cheap schrader valve to the coolant adapter, so it's still usable for me.

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