... : -20 to 120 degree Centigrade; 4)Before delivery, all the items will be strictly tested for its working pressure, leakage, surface finishing ... time and effort.7) All these items are produced by digital CNC machines, then the quality and precision can be ensured ... time.Best after sales service is providedGuarantee:Before delivery, all the items will be strictly tested, not out of shape, not breakage, ...