I will be sure to order the silicone line, thanks. Yeah I thought that out about the T fitting, it's thin polypropylene material, should have been made of acrylic or polycarb. I'll cut off the doom clamp from the manifold first that way I can remove the other in my hand carefully. Either ways, I work in injection plastic molding and these fittings can be found all over the place :lol:It is a 6mm line although I used a 5mm line because I did not have any of the proper size. Be careful when removing the 3mm lines off the T portion of that. It is just a poly fitting and the lines will be stuck to it. Just pulling on the lines with stretch the leg of the T fitting, rendering it useless. The local VW dealership will not carry that part and it is so odd that no FLAPS or hardware store had something the exact same size. Carefully score the tube with a utility knife.
The sound probably came from the vacuum reservoir refilling with air as said above. It is a good sound to have heard, meaning no vacuum leaks in that circuit at least.