The pipe of the gas water heater is buried in the wall. It is made of nylon tube and rubber tube. Is it possible to use rubber tube?
After so many years of consulting, you are the first to ask the hose through the wall. In real life, there are many hoses that go through walls.
Best not to use, now have dedicated 304 stainless steel bellows, hardware stores, large markets are sold, dozens of dollars to get, with gas deal, safety is the most important!
Rubber tubing only. This is because rubber and other organic substances will age, and then easily burst. It's the same in the wall, but it's only a little longer. The consequences of the rupture are unimaginable: gas leaks, gas poisoning, fire explosions, and so on. However, there is a layer of nylon tube protection, rubber tube should be able to use the next renovation of the era without damage, and then added to the upper wall, the effect should be more ideal.
With respect to the through wall gas safety management regulations, it is clear that hoses can not be used through walls.
Plastic pipes and rubber pipes are available, but the length, time and conditions are clearly defined.
