Prevent the above scenario is this: do not easily loosen or tighten the nut, under

Pipe handling: insert fittings pipe surface should be smooth part intact, avoid scratches and other defects. As shown in the bottom of the tube surface is scratched, the sealing joints affected. To end the tube axis perpendicular to the tube, the tube mouth without glitches. If you want to bend the pipe, the pipe ends to set aside a certain length, see below L value, connector manufacturers to follow the advice given value, otherwise it will affect the pipe insertion and sealing. Note Hydraulic pipe fittings matching size and pipe size. If OD3/8inch and OD 10mm pipe, diameter close, but not with OD10mm OD3/8inch the tube connector, and vice versa is also true. Manufacturers usually in metric fittings made ​​a mark, the installation should pay attention to distinguish.