... exchnager 2.Excellent PVC moulds 3.Compact design 4.Seamless titanium tube 5.R22, R134a, R407c, R410a Heat pump heat exchangers ... are made of top quality titanium pipes using advance PVC plastics, with corrosion environmental protection.They ... steel.They passed 4.5Mpa pressure and leaking testing.Pure titanium Seamless tube, or PVC-U, PP-R, stainless steelExcellent ...