Perfect Base Manholes

What are Perfect Bases?

Perfect Base manholes are a custom-made watertight monolithic benched concrete base.

They allow JDP to provide any practical channel inlet/outlet configuration for manholes. Inlets are possible at every angle from 90° to 270° from oulet.

JDP's manufacturing partners allow for swift manufacture and delivery to site just days after order.

Features & Benefits

  • Safer installation - reduced working time in confined spaces
  • Watertight system - the combination of a thicker wall and rubber joint ensures a watertight structure
  • Efficiency - installation times significantly shorter than traditional methods
  • Custom connections - manufactured with integrated couplers to suit any pipe type
  • Low carbon footprint - 40-45% more environmentally friendly than traditional methods
  • Compliant - complies with BS EN 1917 and BS 5911-3 compliant with water authority requirements

Watertight Joint

Watertight joint dimensional cross section.
 

Tongue & Groove Joint

Tongue/groove joint dimensional cross section.

Perfect Base / DN1200

Suitable for pipe diameters 100, 150, 225 & 300mm.

Inlet/Oulet Diameter A B C D E F G H I Approx Weight
mm mm mm mm mm mm mm mm mm mm kg
100 400 325 475 150 150 1500 625 700 125 1710
100 300 225 375 150 150 1500 525 600 125 1550
100 200 125 275 150 150 1500 425 500 125 1400
100 100 25 175 150 150 1500 325 400 125 1250
150 400 325 475 150 150 1500 625 700 125 1710
150 300 225 375 150 150 1500 525 600 125 1550
150 200 125 275 150 150 1500 425 500 125 1400
150 100 25 175 150 150 1500 325 400 125 1250
225 400 325 575 150 150 1500 725 800 125 2020
225 300 225 475 150 150 1500 625 700 125 1870
225 200 125 375 150 150 1500 525 600 125 1710
300 400 325 625 150 150 1500 775 850 125 2150
300 300 225 525 150 150 1500 675 750 125 2000
Dimensions may vary depending on the type of pipe being used.
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Perfect Base / DN1500

Suitable for pipe diameters 375, 450, 525 & 600mm.

Inlet/Oulet Diameter A B C D E F G H I Approx Weight
mm mm mm mm mm mm mm mm mm mm kg
375 500 415 815 200 230 1960 1015 1100 175 5000
375 400 315 715 200 230 1960 915 1000 175 4700
375 300 215 615 200 230 1960 815 900 175 4400
450 500 415 915 200 230 1960 1115 1200 175 5390
450 400 315 815 200 230 1960 1015 1100 175 5090
450 300 215 715 200 230 1960 915 1000 175 4790
450 200 115 615 200 230 1960 815 900 175 4490
525 500 415 915 200 230 1960 1115 1200 175 5390
525 400 315 815 200 230 1960 1015 1100 175 5090
525 300 215 715 200 230 1960 915 1000 175 4790
600 500 415 915 200 230 1960 1115 1200 175 5390
600 400 315 815 200 230 1960 1015 1100 175 5090
Dimensions may vary depending on the type of pipe being used.
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Perfect Base / DN1800

Suitable for pipe diameters 650/675, 725/750 & 900mm.

Inlet/Oulet Diameter B C D E F G I Approx Weight
mm mm mm mm mm mm mm mm kg
650 600 1100 200 300 2400 1300 125 8750
675 900 1400 200 300 2400 1600 125 10180
675 800 1300 200 300 2400 1500 125 9700
675 700 1200 200 300 2400 1400 125 9230
725 600 1100 200 300 2400 1300 125 8540
750 900 1400 200 300 2400 1600 125 9970
750 800 1300 200 300 2400 1500 125 9490
750 700 1200 200 300 2400 1400 125 9020
900 900 1400 200 300 2400 1600 125 9780
900 800 1300 200 300 2400 1500 125 9310
900 700 1200 200 300 2400 1400 125 8830
DN1800 base only available as tongue & groove joint.
Dimensions may vary depending on the type of pipe being used.
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