Pitot Static Lines
This is the easiest, most reliable, and least expensive way to install a pitot static plumbing system. I used 1/8" ID 1/4" OD flexible silicone tubing from McMaster-Carr on 4-5 experimentals and never had a problem. I used barbed 1/8" pipe threaded connectors for the instrument attach and some barbed 1/8" T's and a couple 1/4 to 1/8" ID reducers to complete the system. Slip the tubing over the barbed connectors to complete the system. I used red tubing for pitot and black for static lines. Took me about an hour to install the whole system and it is easy to measure the lines, silicone tubing is leak tight, very flexible and does not kink, and it's easy to modify. I've seen folks paying much more for 1/4" stiff poly pro tubing and connectors and struggling for days to install and still end up with leaks or kinks.
Here are the part numbers, there are many different materials, sizes, and part numbers:
5117K61 Plastic Barbed Tube Fitting Clear Reducer, for 1/4" x 1/8" Tube ID, Packs of 10 $8.27 Per Pack
5463K438 1/8" 1/8 Straight Adaptor Nylon Plastic Semi-Clear White pack of 10 $9.74
5236K832 High-Temperature Silicone Rubber Tubing Opaque Black, Durometer 50A, 1/8" ID, 1/4" OD, 10 ft. $ 6.90
5463K45 1/8" Nylon Plastic Tee Semi-Clear White Pack of 10 $7.37