40mm Deep Chequer Plate Manhole Cover & Frame Usage: For areas with slow moving traffic Chequer plate solid top lids Lids underbraced, where required, to meet required load rating Supplied single seal as standard Available as double seal 400 series twin units have a centre removable beam and frame fixing points For Kitemarked version see KS10 series in kitemarked steel products Manufactured under an ISO 9001:2000 Quality System Finish: Hot dipped galvanised to BS EN ISO 1461 as standard