... made of 3 kinds of material: PVC-U ,PP-R, stainless steel.They passed 4.5Mpa pressure and leaking ... testing.Pure titanium Seamless tube, or PVC-U, PP-R, stainless steelExcellent PVC plasticCompact design with high heat transfer ability ... .Suitable for R22, R134a, R410a,, R407cWorking temperature: -10~50°CModelHeatWater flow rateTube DiameterWater ConnectionRefrigerant In/Out KWm*m ...