DO NOT TRIM any excess gasket material, it will seat itself after bolting the valve into the pipeline, thus providing a positive seal.

不要修正任何多出的垫圈材料，这些多出部分会在将阀门用螺栓锁到管道后重新回到正确的位置，从而实现正常的密封。

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The dual material case is available with high visibility orange trim with a black protective silicone sleeve to seal all ports.

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