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160mm Underground Drainage
Larger-bore PVC-U drainage for main runs, shared drains and higher flows.
160mm Underground Pipes & Couplers
Our 160mm underground pipe is for the main run, where one drain has to carry more: shared runs serving several properties, long runs and larger developments.
FloPlast PVC-U pipe made to BS EN 1401-1, in 3m and 6m single socket lengths, with double socket couplers to join them.
Pipe is supplied with fittings only, so add the bends and junctions you need to your basket.
160mm Underground Fittings
Single socket bends in 15°, 30°, 45° and 87.5°, plus double socket bends in 15°, 45° and 87.5°, so you can change direction without forcing the pipe.
Every bend is a push-fit PVC-U fitting with a ring seal, so joints go together cleanly and stay watertight.
Pick the angle that suits your run, and use the right bend for each change of direction.
160mm Underground Junctions
Junctions bring branch drains into your 160mm main run.
Choose equal junctions at 87.5° (double or triple socket) and 45° (triple socket), or a 160mm x 110mm reducing junction at 87.5° or 45° to take a standard 110mm branch straight into the 160mm run.
Every junction is push-fit with ring seals, so there's no solvent welding.
160mm Underground Chambers & Risers
The 450mm chamber base for 160mm pipe gives you an inspection and rodding point on the main run.
Build it up to ground level with 450mm risers and a sealing ring, then finish with a plastic or cast iron cover and frame.
If you're not sure which parts you need, ring us on 01922 254100 and we'll talk it through.
160mm Underground Adaptors & Accessories
Adaptors join your 160mm drain to other sizes and materials.
The 160mm to 110mm reducer steps the main run down to standard 110mm pipe and fittings, and the 6" clay to 6" plastic adaptor connects new plastic pipe to an existing clay drain.
Use a silicone jointing lubricant on every push-fit joint so the seals seat properly.
Why Choose Our 160mm Underground Drainage?
160mm Underground Drainage - What Makes It Reliable
Our 160mm underground range is built for the main runs of a drainage system, where several branches meet and the drain has to carry more water. The larger bore gives more capacity than 110mm, which is why it's used for shared runs and larger sites.
The pipe and most fittings are FloPlast, made from unplasticised PVC-U. It's strong, light to handle and doesn't rot or corrode in the ground the way clay or metal can.
Every joint is push-fit with a rubber ring seal. There's no solvent welding: chamfer and clean the pipe end, lubricate it and push it home.
The 160mm x 110mm reducing junctions let you bring standard 110mm branches into the main run without extra adaptors, so your 160mm run and 110mm branches work as one system. If you need help planning a run, ring us on 01922 254100.
Installation & Compatibility
160mm underground drainage goes together the same way as 110mm. Every component is push-fit with a captive ring seal, so there's no solvent welding.
Lay the pipe on a compacted granular bed, typically 100mm deep, with a smooth, even base that supports its full length. Keep a steady fall towards the outfall; your building control officer or drainage design will confirm the gradient for your job.
Cut pipe square, remove any burrs, chamfer the end and wipe it clean. Apply a thin coat of silicone jointing lubricant and push the spigot fully into the socket so the ring seal seats properly.
Use the right bend for each change of direction rather than forcing the pipe. Where you need to rod or inspect the run, build in a 450mm chamber.
To bring a 110mm branch into the 160mm run, use a 160mm x 110mm reducing junction. To step the whole run down to 110mm, use the 160mm to 110mm reducer.
Test the run before backfilling. BS EN 1610 sets out the air and water tests for checking the joints.