Underground Drainage Ref: TDS-UG-110-001

110mm Underground Drainage System

Technical Data Sheet

All Specifications

110mm Underground Drainage System

Technical Data Sheet

Document Reference: TDS-UG-110-001
Issue Date: February 2026
System: 110mm Ring Seal Underground Drainage

Product Description

The Kalsi 110mm underground drainage system is the UK standard for domestic foul and surface water drainage. Manufactured to BS EN 1401-1 with Kitemark and BBA certification, this system meets Building Regulations requirements and water authority specifications. Suitable for depths from 300mm to 10m with standard SN4 stiffness rating.

System Dimensions

Pipe

DimensionValueTolerance
External diameter110mm±0.3mm
Internal diameter103.6mm±0.3mm
Wall thickness3.2mm (SN4)±0.2mm
Available lengths3m, 6m±5mm
Weight1.45 kg/m-

Standard Joint System

PropertySpecification
Joint typeRing seal (push-fit)
Seal materialEPDM rubber
Angular deflectionUp to 3° per joint
Insertion depth[TBC]

Pipe Stiffness Classes

ClassRing StiffnessTypical Depth
SN44 kN/m²300mm - 10m
SN88 kN/m²Available on request

Hydraulic Performance

Flow Capacity (Full Bore)

GradientFlow RateVelocity
1:408.2 L/s1.0 m/s
1:606.7 L/s0.8 m/s
1:805.8 L/s0.7 m/s
1:1005.2 L/s0.6 m/s

Minimum Gradients (Building Regulations)

ApplicationMinimum Gradient
Foul drainage1:40 (min) to 1:110 (max)
Surface water1:100 minimum

Material Specification

PropertySpecification
MaterialPVC-U (unplasticised polyvinyl chloride)
StandardBS EN 1401-1:2019
ColourTerracotta (foul), Grey (surface water)
Chemical resistanceResistant to typical sewage and surface water
Temperature range0°C to 60°C (continuous)

Physical Properties

PropertyValueTest Method
Ring stiffness (SN4)≥4 kN/m²BS EN ISO 9969
Impact resistance (0°C)TIR ≤10%BS EN 1411
Longitudinal reversion≤5%BS EN 743
Vicat softening temp≥79°CBS EN 727

Colour Coding

ColourApplicationNotes
Terracotta/OrangeFoul water drainageStandard domestic
GreySurface water drainageRainwater, groundwater

Colour coding aids identification during future excavation works.

Product Range Summary

Pipes

DescriptionPart CodePack Qty
Plain Ended Pipe 3mUGP3M90
Plain Ended Pipe 6mUGP6M90
Single Socket Pipe 3mUGPSS3M90
Single Socket Pipe 6mUGPSS6M90
Single Socket Pipe 6m SlottedUGPSS6MS90

Couplings

DescriptionPart CodePack Qty
Double Socket CouplerUGPVCB50
Slip CouplerUGCPVCS50
Single Socket CouplerUGPVCS50

Bends

DescriptionPart CodeAnglePack Qty
Double Socket BendUGB9090°25
Double Socket BendUGB87.587.5°20
Double Socket BendUGB4545°35
Double Socket BendUGB3030°35
Double Socket BendUGB1515°35
Single Socket BendUGSB9090°25
Single Socket BendUGSB87.587.5°20
Single Socket BendUGSB4545°35
Single Socket BendUGSB3030°35
Single Socket BendUGSB1515°35
Rest BendUGB87.5RB87.5°15
Adjustable Bend 0-45°AB010-45°25
Adjustable Bend 0-90°AB020-90°16

Junctions/Branches

DescriptionPart CodeAnglePack Qty
Triple Socket BranchUGJTS87.587.5°14
Triple Socket BranchUGJTS4545°14
Double Socket BranchUGJDS87.587.5°14

Access Fittings

DescriptionPart CodePack Qty
Socket PlugUGAP550
Access Bend 87.5°UGAB20
Access PlugUGAPL32
Long Radius Bend 45°UGLRB451
Long Radius Bend 87.5°UGLRB87.51
Aluminium Rodding EyeUGAF625

Hoppers

DescriptionPart CodePack Qty
Integral HopperUGH116
Square HopperUGH320

Gullies

DescriptionPart CodePack Qty
Low TrapUGG115
Lowback P TrapUGG310
Back Inlet Roddable GullyUGG48
Plain Ended Roddable GullyUGG68
Back Inlet Gully Round TopUGG7BM6
Back Inlet Gully Square TopUGG8BM6
Gully Extension (UGG4/UGG6)UGG46EXT10
Gully Extension (UGG7BM/UGG8BM)UGG78BMEXT10

Grids

DescriptionPart CodePack Qty
Square Alloy Grid 150×150mmUGSP11
Square Plastic Grid 160×160mmUGSP21
Round Plastic Grid 160mmUGSP31
Round Alloy Grid 180mmUGSP41
Round Grid for UGG7BMUGSP71
Square Grid for UGG8BMUGSP81

Inspection Chambers

DescriptionPart CodeInvertPack Qty
320mm Chamber BaseUGMBS185mm81
320mm Raising PieceUGRS140mm135
320mm Plastic Cover RoundUGMC1PL-102
320mm Plastic Cover SquareUGMC1PLSQ-72
470mm Chamber BaseUGMBL225mm32
470mm Raising PieceUGRL235mm32
Riser Reducing Ring 470-320mmUGRR-10
470mm Plastic Cover RoundMCCRPL-52
470mm Plastic Cover SquareMCCRPLSQ-52
Galvanised Cover 600×450mm24X18MC-1
Galvanised Cover Double Seal24X18MCDS-1

Lubricant

DescriptionPart CodePack Qty
Soluble Lubricant 1LKPSL100024
Soluble Lubricant 2.5LKPSL25004
Soluble Lubricant 5LKPSL50001

Installation Guidelines

Trench Preparation

RequirementSpecification
Minimum widthPipe OD + 300mm
Bed depthMinimum 100mm granular
Side support150mm minimum each side
Crown cover300mm above pipe crown

Bedding Classes

ClassDescriptionApplication
Class DGranular, 100mm bedStandard domestic
Class NNative materialNot recommended
Class BGranular surroundTraffic areas
Class SConcrete surroundHeavy loading

Gradient Requirements

ApplicationMinimumMaximum
Single dwelling foul1:401:110
Multiple dwelling foul1:401:80
Surface water1:100-

Access Points

RequirementSpecification
Max distance from building12m
Max between access points45m
At direction changesRequired if >45°

Standards Compliance

  • ✓ BS EN 1401-1:2019 - Plastic piping systems for non-pressure underground drainage
  • ✓ BSI Kitemark certified
  • ✓ BBA certified
  • ✓ Building Regulations Approved Document H compliant
  • ✓ Lead-free formulation
  • ✓ ISO 9001:2015 manufactured
  • ✓ UK manufactured

Guarantee

Product Guarantee: 30 years against manufacturing defects

Subject to correct installation per manufacturer guidelines.

© Kalsi Plastics Ltd. All rights reserved.

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