A 2-Way 30" Stopple was performed at South Ealing Road W5, for KLT . Flowstop Services regularly perform these operations up and down the UK. These pictures show how the operation is performed and planned in . Using two 30" Hydraulically operated stopples and a safety bag stop system at each end, Flowstop Services were able to stop the flow of gas in the main, without causing any disruptions to service. We were then able to cut out the main, where needed, safely and gas free. KLT were then able to carry out their task of capping off the ends of the cut main to eliminate leaks or to attach a new valve to the main .