GRP Manhole Systems


It all began quite modestly at the Basle Dye Works in 1957 where wooden cylinders were employed for the dyeing process. These kept splintering and deforming after some time putting the expensive textiles at risk. Seeking a suitable replacement for the cylinders, the factory’s engineers developed a centrifugal casting method using glassfiber reinforced plastics (GRP). Thanks to the method and material, they achieved perfectly concentric cylinders with a precise outer diameter and smooth surface – just as required.

HOBAS Manholes

HOBAS manufactures a full line of pre-assembled GRP Manholes. HOBAS manholes are installed quickly and with minimal effort saving time and money on the job site. Our manholes are very longlasting and water-tight/airtight.

The HOBAS Manhole shafts are made of HOBAS (CC-GRP) and are manufactured to the worlds toughest standards. The shaft height is measured from the floor channel to the top edge of the cover frame or lid. Joints between the individual manhole parts, such as concrete cones, pipe shafts are rendered completely watertight with bearing ring seals.

HOBAS Manholes are made with the finest materials and sophisticated manufacturing technology for consistent reliable manholes for every job, every time. Read more here

Standard Manhole consisting of:

The HOBAS Standard Manhole is made of GRP and is hence corrosion resistant on both the inside and outside. It consists of a HOBAS Pipe with a suitably designed channel.



  • Non Circular Pipe
  • Tanks
  • Access Chambers
  • Maintenance Shafts
  • Relining Pipe
  • Gravity Pipe CC