Only place I've ever seen Silicone hose was surgical hose.
But your concern with changing the hoses on the heater core of
Ranco valve are well founded. Had to change the hoses on my '50
last month and they were virtually 'vulcanized' to the copper.
I don't use any sealer on my hoses so it's just rubber on copper.
http://www.pbase.com/dennygraham/image/160352218 Ya gotta be real careful cuz that thin copper bends so easy.
dg
