Tee connector for 1/4 inch tubing hose
thingiverse
This fits 1/4 inch tubing. The tubing squeezes in nice and tight and is held by friction. I have not tested it too find out the max pressure it can hold. But I only need it for vacuum and it works great for that. After printing, I used a 1/4 inch drill bit to make the tubing fit better. I printed it with supports touching the build plate.
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