How can I distinguish a German type release valve from a Belgian type?

There are release valves with a smaller pipe that are absolutely perfect to use. To distinguish between the two types of release valves, you need to carefully study the head of the release valve: the compatible head is provided with a tube of approximately 5 mm and a flat seal (black, rubber band), the tube of the non-compatible head has a length of approximately 9 mm and no seal. You can see this clearly in the illustrations on this page.

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