1、The Tongue &Groove mechanism in combination with a slightly shortened key diameter provides a mechanical and frictional interlock resulting in a rigid joint which reduces undesired angular movement.
2、The build-in teeth on the coupling grip the groove shoulder and serve to reduce linear movement.
3、The Tongue&Groove mechanism features a slight offset at the foot of the coupling halves which serve to protect the gasket from exposure.
4、With the Tongue&Groove style coupling no metal-to-metal contact of the bolt pads is required you will normally see a 1.6mm to 3.2mm gap between the bold pads when installed.
5、Make the pipeline form a firm and solid whole, which is suitable for construction workers who do not require axial displacement and rotation.
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