With the functions of rainproof, paraffin scraping and dual-seal, the device has strong economical and practical value.
该装置具有防雨、刮蜡、双重密封等多种功能，具有很强的经济价值和实用价值。
2
The invention relates to a dual-seal toilet stool, belonging to a sanitary ware and consisting of a toilet stool body, a mechanical seal device and an inlet valve;
一种涉及卫生洁具的双重密封坐便器，由坐便器主体、机械密封装置和进水阀组成。
3
Labyrinth seal and piston ring provide a dual sealing system, keeping oil clean and reducing wear.