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What is it? And more importantly, how long will it last? Black 'rubber' radiant heat tubing circa 19
I am a home inspector and used to seeing the various different types of radiant heating tubing used for loops.
The home in question was constructed in 1986 in Whistler BC Canada and would be considered higher end (architecturally designed, Pella windows, radiant heating etc).
I don't know what the tubing is, and more importantly, what sort of expected service life there might be.
Tubing feels like/looks like the rubber hosing used to connect the radiator expansion tank. No visible markings, appears to be stretch fit over nipples/fittings on manifold.
Not PEX, poly B, entran or any of the 'usual'
Any advice as to what it is (and how much longer it should last) would be appreciated.