Manthorpe Building Products

Roof Ventilation

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Flexible Pipes

Specially designed for use with the Manthorpe Alpha Vent for Slates, the Manthorpe Flexible Pipe, GRPA, provides an economical, quick and effective connection to standard 4" soil pipes and ventilation ducting systems.

The 455mm long pipe is made from flexible, low-density polyethylene and is supplied with worm drive band clamp for secure fitting.

The extra long GRPA/2 has all the benefits of the standard GRPA Flexible Pipe but with an extended reach of 800mm, and extension length of 345mm.

Alternatively the GRPA/1 Flexible Pipe is designed for coupling 4" ventilation products to 4’’ soil pipes or mechanical extraction equipment. Also made from flexible low density polyethylene, the 692mm long pipe makes fitting 4" roof ventilation products to soil pipes or mechanical extraction equipment even easier.

Each Manthorpe Flexipipe allows 8,000mm² of airflow and is supplied with its own metal screw clamp for simple fixing.

The GRPA3 Reduction Adaptor fits over the Flexible Pipe end and can be used convert the 4” diameter product to attach to 3" ventilation products.

Product Benefits

  • GRPA and GRPA/2 fit the oval spigot of the Manthorpe Alpha Slate Vent
  • GRPA/1 suitable for 4" ventilation products  to 4" extraction connections
  • Pipe lengths vary from 455mm to 800mm
  • GRPA/3 reduces 4" pipes down to 3"
  • Screw clamp for simple fixing

Product Specifications

Product Code Description Free Airflow Size Material Colour Box Qty
GRPA Oval Opening Flexible Pipe 8,000mm² 455mm long Polyethylene Black 10
GRPA/1 Round Opening Flexible Pipe 8,000mm² 692mm long Polyethylene Black 5
GRPA/2 Oval Opening Flexible Pipe 8,000mm² 800mm long Polyethylene Black 5
GRPA/3 3" Reduction Adaptor 5,280mm² 4" to 3" dia. ABS Black 10