I broke this plastic bit in my van being a bit heavy-handed while trying to access the manifold coupling hoses. I’m fixing some air leaks and made a big new one – gotta fix it now, too! It’s VW/Audi part number 251611755, and it seems to be NLA. It’s part #11 in this diagram. Nor could I find a part similar enough, except maybe this miniature reducing union tee in brass.
But my best buddy showed me a trick!
Drill out the main part with a 11/64″ drill bit 3-4mm deep. I turned the bit by hand, being careful to keep it parallel with the outlet. Then just seat the broken-off piece into the hole, using a tiny touch of ABS glue and a short, gentle spinning motion while seating it. After the glue is dry, make sure the hose is patent by sending down a ~5/64″ drill bit, again by hand. This is a permanent fix – until you break it again!