Blowout-proof Stem uye Primary Stem Seal
Stem shoulder chikamu chakakosha chedzinde, chinochengetwa mukati kudzivirira kuputika kwedzinde kubva mukumanikidzwa mumhango yemuviri.Yekutanga stem chisimbiso inodzivirira kuvuza kumhepo, inoshandawo seyakaderera-torque inotakura.
Zvakarurama, Smooth Bhora
Bhora sphericity uye kupera kwepamusoro zvinhu zvakakosha muhupenyu hwevharuvhu, kugona-kubata simba, uye torque yekushandisa.