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Hot sell BST-2 BST-4 air oil transformers
Hot sell BST-2 BST-4 air oil transformers are two models of BST hydraulic booster.

Their structure is the same, the difference is their equipped air cylinder size. BST-2 is equipped with a smaller air cylinder, while BST-4 is equipped with a larger air cylinder, so BST-4 increase oil pressure is larger than BST-2 air oil transformer.
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