Difficult to distinguish the pros and cons of hose fittings Appearance

According hardware products quality inspection center of the king's work , at present many companies in pursuit of profit , reduce costs, reduce the product 's material , the use of obsolete iron ( easy to rust ) , zinc alloy ( without preservative ) and other soft metal as a raw material  Hydraulic tube fittings production, resulting in product quality problems. It is understood , fittings and hose quality tests, material, thickness and other issues resulting metal hose coupling strength properties and confined performance not up to standard , this should cause the user's attention .