Siv rau kev txiav lossis cais cov kav dej, qhov muag tsis pom flanges yog qhov tseem ceeb boltable dawb paug discs.Thaum txhim kho kom zoo thiab ua ke nrog cov gaskets kom raug, lawv tuaj yeem ua tiav lub foob zoo heev uas yooj yim tshem tawm thaum xav tau.