- protective ring for cylinder liner
- 缸: jar; jug; vat; crock
- 护: protect; guard; shield
- 圈: circle; ring
- 护圈: band guard; guard ring; protecting ring; protective ring; retainer; separator; shroud; sight protector
- 缸套: cylinder jacket; cylinder liner; pumcylinder、pum liner cilindro; sleeve
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