We used a rubber pipe to make a fire and tried to cook the leather in an empty [porridge] can.

This was easily corrected by the use of a rubber pipe.

The police find a length of rubber pipe stained with soot.

The rubber pipes you speak of are known as leak-off pipes and usually fail first, so your dealer did the right thing.

Engine coolant flows through it via two rubber pipes — one in, one out — and a fan blows air through it into the cabin.