Quote:
Originally Posted by ellie
What is #20??
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My guess is that it is a piece of rubber tubing.
It allows you to connect the hard plastic hose to the hard plastic nipple on the vacuum canister.
If you look at # 19 in the diagram it looks the same.
Then look at the first picture in the first post. You can see #19 just below his thumb.
Bit of rubber tubing connecting a hard three way connector to a one way check valve.