On Thursday, August 8, 2019 at 10:34:23 AM UTC+1, Surge wrote:
On Wednesday, 7 August 2019 18:27:34 UTC+2, Tango Whisky wrote:
Exactly. Tubing should be silicone. No additional devices needed.

I can't agree more. Silicone tubing will practically last the rest of your lifetime, it never leaks and it reseals when removed and reconnected.

I used "food grade", thick walled, silicone tubing sourced from China due to the low price (around $50 for 12 meters) and free shipping. Red for pitot, blue for static, black for T/E.

PVC tubing is for fish tanks.

Behind the panel soft silicone tubing needs a lot more care on installation to ensure that it is fully supported otherwise it moves around in turbulence and when pulling G and that can cause pressure change to the vario. PVC tubing also needs care in that respect but less so. I never use silicone tubing or donuts or tie wire and have never had a leak at the instrument. I take care to make sure that T pieces etc are free of flashing - metal ones are better. The only downside of good PVC tubing is that a 90 degree bend that looks OK on installation can go flat over the years and cause a blockage so I always use 90 degree corner joining pieces instead.