copper coil heat exchanger widely used in refrigeration industry High quality,Reasonable price. copper coil heat exchangerSuitable for R134A, R22, R404A, R407C refrigerant ... 25*21.65MM and 12.7*19.05MM10.did gas examination under 3.0Mpa air pressure to ensure the ... , expanding, digressing, dryingWelding, leakage test, bending, inspection, packingNote: for further information please contact us.