fin evaporator coil copper tube: 7mm,7.94mm,9mm,9. ... flat,corrugated fin did 3.0MPa nitrogen test fin evaporator coil Suitable for R134A, R22, R404A, R407C refrigerant and so ... 7*19.05MM10.did gas examination under 3.0Mpa air pressure to ensure the tightness.11.widely used ... expanding, digressing, dryingWelding, leakage test, bending, inspection, packingNote: for further information please contact us.