john crane type 21 double mechanical seal The performance index of john crane type 21 double mechanical seal is in the domestic leading position. Our company - Guangzhou Lepu Machinery CO., LTD didn't design to industry standards, we design and develop beyond them. Adopting only the highest quality sustainable materials, the product is China-made with purity, craft and timeless appeal in mind. It meets some of the world’s most stringent performance standards.

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