My Wrekin

Our products

Hercules™ D400 manhole covers

Our Hercules range has been designed as the ideal solution when a very large manhole cover is required for a D400 Group 4 environment.

The products have been designed and manufactured to meet the enhanced requirements of CD 534 (formerly HA 104/09) and BS EN 124:2015. Additionally, the covers include features designed to provide both greater operator safety and operational longevity.

Hercules manhole cover render

The double triangular covers are indexed to ensure correct orientation when fitting. The cover’s M16 blank bolt can be replaced with a threaded lifting eye for mechanical lifting – the position of the bolt is at centre of mass, allowing safe and level lifts.

The covers feature a small window allowing for easy and safe inspection without the need to remove the entire cover.


  • 60+PSRV tested at top surface of chequer by UKAS accredited 3rd party.

    PSRV tested
  • Anti-flex covers prevent the causes of cover seating wear, eliminating excessive noise and catastrophic failure.

    Anti-flex cover
  • Specially designed cover support geometry reduces movement relative to the frame, minimising seating wear.

    Cover support geometry
  • Enlarged frame corners help to dissipate, load minimising bearing pressure.

    Enlarged frame corners
  • Indexed corners ensure correct orientation first time, every time.

    Indexed corners
  • Inspection window allows safe and easy view into chamber.

    Inspection window


Wrekin product code Range Overall frame size (A x B) Clear opening size (C x D) Frame depth (E) Base opening size (F x G) My Wrekin
DMT0D6/1212/4 Hercules 1,385 mm x 1,385 mm 1,200 mm x 1,200 mm 150 mm 1,230 mm x 1,230 mm
DMT0D6/1515/2 Hercules 1,685 mm x 1,685 mm 1,500 mm x 1,500 mm 150 mm 1,530 mm x 1,530 mm
DMT0D6/1818/2 Hercules 1,990 mm x 1,990 mm 1,800 mm x 1,800 mm 150 mm 1,835 mm x 1,835 mm

Available options and accessories


  • Ventilation holes
  • Enhanced anti-slip coating
  • Alternative badging
  • Sealing plate
  • Safety grille
  • Locking
  • M16 x 50mm Lifting Eyebolts


Additional M16 lifting points are present on Hercules cover sizes exceeding 1200×1200 Clear Opening in lieu of BS7903 Lifting Keyways, for alternative methods of mechanical cover lift. The Hercules 1,200 x 1,200 mm cover is the only cover in the range to have keyholes for manual lifting.