1. Card convex features:

Easy installation, the connection inside and outside are not deformed, belong to the flexible connection, easy maintenance. Scope of application: cold water system, pipeline direct drinking water system, water treatment equipment system. Open installation is more applicable, mainly considering thereplacementof the sealing ring, the hot water system to avoid using as far as possible. The advantage of this kind of connection is simple installation, convenient, easy to maintain, that is, when the sealing ring inside the tube aging needs to replace relatively simple and convenient, as long as the nut can be replaced. 
 
The disadvantage is that the application is single, in the hot water system sealing ring aging is more prominent, the cost is higher. Dark piping and hot water systems are generally not recommended.
 
2. Clamping features:
 
Easy installation, connecting the external pipe, internal rubber ring pressure into hexagon. Scope of application: cold water system, pipeline direct drinking water system, open installation pipeline is more applicable. Advantages are: simple and convenient connection, short working hours, moderate cost. 
 
The disadvantage is that the applicable situation is single, maintenance is troublesome, that is, the sealing ring in the tube needs to be replaced when aging is more troublesome, because the connection has been stuck, the replacement is to need to cut the two ends of the pipe fitting before replacement. Hot water
 
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