Single ball shuttle valve with 3 ports for in-line plumbing: pamene madoko V1 ndiV2 imalumikizidwa ndi mizere ya ntchito ya 2, valavu imapereka mphamvu yapamwamba kwambiri ya 2ku doko wamba C. Mpira umodzi umalola kuwonongeka kwa chizindikiro chokakamizapamene madoko onse a ntchito amatsika mpaka pamlingo wocheperako.