The metal content is tenuous, but its for a water torch that I use for brazing and welding very small parts. The water torch has something called a "gas booster" which contains a volatile chemical (usually MEK) that gets mixed with the oxy-hydrogen generated by the water torch, and has a transparent flexible tube (3" long,0.25" ID)in it that acts as a sight glass for checking the MEK level. Over the years, this has become opaque, brittle, and is no longer gass tight.
Can anyone suggest a suitable replacement tube please? It must be flexible, transparent, and resistant to chemicals such as MEK.