205,206,207 Department of axial-type double-end, multi spring, drain, drive units drive Kettle mechanical seal. 205 is non-balanced, 206 Department of Air-side balanced, double-ended balanced line 207. This model is currently HG5-748-78 standard (78 standards), and HG2098-91 standard (91 standards), the installation of different size, selection, please note. Sub-surface mounting flange sealed (Ⅰ) and tongue and groove type (Ⅱ) type two. After filling in the calibration model. Customers size requirements can also be processed.