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110mm Underground Drainage

Full 110mm underground drainage range

Kents now offer the full range of FloPlast’s 110mm underground drainage system.

Everything from a Bottle Gully to an Access Chamber, the whole job can be supplied by us.

FloPlast underground drainage systems have been designed to be able to work up to 10m in depth for gravity drainage and sewage situations. Most of the parts are PVC-U, with the remainder being made of Polypropylene

All joints are push fit and incorporate a captive seal and snap cap which ensures a user friendly experience in the low access areas they will be installed in.  There are no sharp edges on any of the parts which may cause injury or damage to seals, so you can be sure once you fit them they are sealed for good.

Features & Benefits

110mm Undergroud Drainage – what goes where?

If you don’t get much call for underground drainage, it can seem a little daunting, there are a lot of similar parts. This image clearly points out which parts are to be used where. Its a good reference point for experienced fitters too.

110mm underground drainage exploded diagram

Currently we can supply any of the parts in the above diagram apart from the soil pipe. We do supply all the plastics involved in rainwater drainage however.

Need help with 110mm underground drainage installation?

FloPlast have created the following installation video with outlines some of the benefits of using their 110mm underground drainage system.


More installation info

Trench detail and backfill material

Its important to dig the right sized trench. It should be prepared 300mm wider that the outside dimensions of the pipe being used. I.E. a 110mm underground pipe should be in a minimum of a 410mm trench.

The bottom of the trench should be cut square and flat, and all pipes should be either be led onto a bed of pea shingle or similar. Some fixtures will require a slab to sit on to provide adequate support. Pipes should be covered in more pea shingle to the crown (top of horizontal pipe)of the pipe, then the material that was dug out of the whole can be used to backfill the trench up to the required height. Compaction is required after 300mm of backfil.




Adaptors Adaptors

Rainwater downpipes can connect to the underground drainage in a few different ways, through a surface water drain or a gully trap. A suitable universal adaptor is available to connect downpipes straight into the underground pipe work. 110mm soil pipe is a direct fit to the FloPlast underground system and so can connect straight up. Where downpipes or older cast iron soil pipes need to be connected there is a range of rigid and flexible couplings to join the two.

Access and Rodding Points

Access and Rodding Points Access and Rodding Points

An often overlooked area. Access is very important in all applications for testing, inspection and blockage removal. Pipes can be rodded in both directions with a number of different fixtures that we supply. Mini Access Chambers and 450mm Large Inspection Chambers are available and are an perfect fitting to allow rodding in many different directions,

Inspection Chambers


Mini Access Chambers (MAC)

Mini Access Chambers (MAC)

A mini access chamber has a narrow riser of 300mm in diameter. These can be used upto 600mm in depth. Additional risers can be used to vary the height is needed, and can be cut at premarket heights to perfectly match the ground height. Flexible connections are available on one model of the MAC which allows for 10° of adjustment in any direction to aid and assist in installation. The frame and manhole cover should be set into a minimum of 50mm of concrete at ground level. The MAC has 5 connections, and any unused connections should be plugged up before fitting. The main flow should be routed directly from one side to the other and any changes in direction of it should be done outside of the chamber.

Large Inspection Chambers (LIC)

Large Inspection Chambers (LIC)

The larger diameter of the LIC means it can be buried at an increased depth of 1200mm when used with its standard 450mm opening cover, and 3000mm when using the 350mm reduced access cover.  Separate risers can be simply stacked on top of each other to line a deeper installation, and the top most riser cut to the required finishing height. As with the MAC, it is to be sat on a suitable bed and finished at ground level in a 50mm minimum concrete edge. It too has 5 inlets and on some models has adjustable inlets allowing for minute adjustment to make installation quicker and easier.


Traps Traps

There is a wide range of traps available to do similar jobs. Traps are designed to take away either surface water, rainwater from a downpipe or waste water prom domestic appliances. They all incorporate a water trap which helps prevent odours from the drainage system fro being expelled above ground. All gully traps need to be seated on a suitable solid concrete slab to stabilise them. The universal Gully trap (D500) and the Low Back ‘P’ Trap (D501) both require a separate hopper inserted in the top and fixed in place at the required ground level.

A Bottle Gully has a screw down built in hopper and grate and is easily rodded to clearing blockages. Gully risers can be used to set the Bottle Gully deeper into the ground. Back inlet bottle gullies have a removable plug to allow for additional pipe connections through the back.