trench sheeting trench sheets accessories piling guides trench lining systems introduction backhoe box manhole backhoe box ks60 trenchbox ks100 trenchbox manhole box ks300 trenchbox dragbox edge protection groundwork equipment hydraulic walers manhole brace shaftbrace tankbrace multibrace super shaftbrace 20m brace 'K' brace extensions bracing struts formwork/falsework system 160 soldier MkII soldier light panel formwork parapet support system scaffold refurbishment propping needling façade retention heavy propping other equipment manhole shutters manhole lifting pins air test stoppers EMV pipe laser culvert puller trench struts adjustable props roadforms ladders skips and trays fencing road/walkway plates trench crossing units dura-BASE mats about us who we are the mabey group depots & works career opportunities service & support get in touch customer portal login products trench sheeting trench lining systems groundwork equipment formwork/falsework refurbishment other equipment ethics policy code of ethics      air test stoppers Air test stoppers have an inflatable ring with a central membrane Designed for standard air testing of pipes up to 100mm of water over air Very light Easy to transport When deflated can be easily passed through a restricted opening Inflation is by foot pump Manometers are also available for hire Diameters available: 300, 375, 400, 450, 525, 600, 675, 750, 800, 825, 900, 975, 1000, 1050, 1200 and 1350mm