This kind of bell-nipples are developed on the basis of conventional bell-nipples, adopting high-strength annular magnets which are arcuate door installed.

• 组合式高强度环形磁铁防溢管是在常规防溢管的基础上，采用高强度环形磁铁，用弧形门装环磁，磁铁可拆换。