P ipestoppers ATO Stoppers and test plu g s are avail a ble in pp er can be used as a test end or a blank end and they are totally collapsable and li a ll sizes from 300mm - 1800mm. Each AT O is man u fac tured g ht in wei g ht mak-in t o the s p ecifi c p i p e size with a variation of ٱ 6mm. g them easy to handle.Each sto T he stoppers comprise an infl atable outer rin g with a 5 pp er has a soft central memrane with a schrad-er valve for infl ation. The m m thick closed cell neo p rene rubber out, bonded on for y are also fi tted with a preset and tam e x cel lent sealin g propertiesEach sto p er p roof relief valve.A pull ta g is fi tted for defl ation and there are no re- mov a ble p arts. >