Equipment page · Plumbing / shared drainage

Bunk Lower Parliament shared drain system

Dedicated troubleshooting page for the shared under-counter drainage connected to the ice machine, sink and glasswash. The leak appears to be from more than one joint, so treat this as a small shared waste system issue rather than a single loose fitting.

Start leak checks See rebuild approach
Venue
Bunk Lower Parliament
Address
Lower Parliament Street / Nottingham area · exact address to confirm
Area
Bar/back-of-house plumbing below ice machine / sink / glasswash
Asset type
Shared appliance waste and drain pipework
Visible fittings
White compression waste fittings + black waste pipe + appliance drain hoses
Status
Open · multiple leak points suspected

Search this equipment page

Find washers, trap, compression joint, ice machine, glasswash, or rebuild notes

Streamlined issue brief

Shared ice/sink/glasswash drainage leak

Shared waste system with several possible leak points.

OpenMultiple leak points suspected across shared drainage manifold

1. Symptoms and evidence

  • Leak connected to ice machine/drainage system.
  • Sink and glasswash also lead into same waste system.
  • Photo/video show shared under-counter waste pipework and water.

2. Suspects

  • Old/hardened compression washers.
  • Loose nuts from vibration/movement.
  • Side-strained or unsupported pipework.
  • Cracked fittings, poor fall, downstream blockage or appliance hose adaptor faults.

3. Expand resources

Manual / how-to / error reference

Typical UK commercial waste pipework: likely 40mm compression fittings, black waste pipe and appliance drain hose connections. Confirm sizes on site.

Troubleshooting tests

Dry all joints, test sink only, ice machine only, then glasswash only. Tissue-test each joint to find first wet point.

Diagram / parts / sources

Rebuild as supported 40mm waste manifold with correct tees/swept bends, hose spigots/standpipe/tundish/air gap, new washers, constant fall and rodding access.

4. Updated solution/status

Open: inspect/rebuild shared waste branch/manifold; confirm ice machine drain has correct backflow/air-gap protection.

Issue history for this drainage system

Choose the problem type

This page is for the shared waste pipework serving the ice machine, sink and glasswash area. Future repeat leaks or blockages should be added here under the same plumbing asset.

Open · 2026-05-26

Multiple leaks from shared appliance drain pipework

Water is visible on the floor around the shared waste pipework. The leak appears to involve more than one joint/branch.

Open troubleshooting log

Blocked downstream waste / backpressure

Check if water rises or leaks when glasswash/ice machine discharge heavily.

Ice machine drain / air gap

No separate issue logged yet, but ice machine drains should normally have a safe air gap/tundish arrangement.

Glasswash discharge hose

No separate issue logged yet. Check hose spigot, clip, standpipe and trap.

Sink waste / trap

No separate issue logged yet. Check basket waste, trap washers and branch connection.

Pipe support / fall

Poor fall or unsupported pipework can pull compression joints out of square.

Current issue log · Shared drainage leak

Troubleshooting sequence

1Dry all pipework and the floor fully. Put blue roll/tissue around every visible nut, hose spigot, trap, tee and wall outlet.
2Run one source at a time: sink only, then ice machine drain/test pour, then glasswash drain cycle. Do not run everything together first.
3Mark the first wet point for each source. Multiple wet points can mean several worn washers or a downstream restriction/backpressure.
4Open the leaking compression joints, clean grit/grease, replace tapered washers, then reseat squarely with no side strain.
5If pipework is old, unsupported, badly aligned or has several leaks, rebuild the branch/manifold instead of chasing one joint at a time.

Most likely causes

Why it may leak in several places

  • Old compression washers: rubber/cone washers harden, flatten, split or twist with age.
  • Misalignment: pipes under side-load stop washers seating flat.
  • Loose compression nuts: vibration from glasswash/ice machine discharge can loosen fittings over time.
  • Cracked plastic fittings: overtightening or impact can split nuts, elbows, tees or trap bodies.
  • Blocked downstream waste: when several appliances share one drain, a partial blockage can push water back through the weakest joints.
  • Poor fall/support: sagging horizontal pipe holds water and strains joints.
  • Wrong appliance connection: drain hoses pushed loosely into pipework or missing clips/spigots can weep during discharge.

Current priority: prove whether the leak is from individual joints or from backpressure. If several joints leak during heavy discharge, rebuild and check downstream blockage/fall.

Pipework and connectors seen / expected

Likely UK waste fittings to identify before buying

The photo/videos show common under-counter commercial waste plumbing rather than manufacturer-specific appliance parts. The close-up trap video that was previously shown on the Loughborough sink page has been moved here because it belongs to this Lower Parliament ice machine / sink / glasswash shared drainage problem. Measure the outside diameter and take photos before purchasing. Bar/sink/glasswash wastes are commonly 40mm / 1½ inch, while smaller basin wastes are commonly 32mm / 1¼ inch.

Black pipe

Black solvent-weld or push-fit waste pipe

The black horizontal pipe likely forms part of the shared waste run. Confirm whether it is solvent-weld or push-fit before mixing parts.

Search: 40mm black waste pipe · ABS solvent weld waste · push fit waste pipe
Branches

Tees, swept bends and manifold pieces

Use proper tee/manifold fittings rather than forcing hoses into open pipe ends. Swept fittings reduce blockage/backpressure compared with tight bends.

Search: 40mm waste manifold · 40mm swept tee · appliance waste connector
Hose

Appliance waste hose spigot/adaptor

Glasswash and ice machine hoses should be secured to the correct spigot or discharge into a trapped standpipe/tundish arrangement, not left loose.

Toolstation · Appliance Half Trap 40mm Screwfix · search appliance trap 40mm
Toolstation appliance half trap checked at about £11.99. Search: appliance waste hose connector · hose spigot trap · jubilee clip stainless

Supplier comparison: Screwfix for fast McAlpine trap/compression fittings; Toolstation for McAlpine traps and appliance half trap; B&Q for FloPlast trap and washer packs; BES/DIY Direct for washer-only spares; Amazon only as fallback if local trade counters are out of stock. Prices change, so treat page figures as guide prices and confirm live branch stock before buying.

Recommended reconstruction approach

How I would ask a plumber to rebuild it

  1. Map the system first: label every inlet: ice machine drain, sink waste, glasswash discharge, main outlet/wall drain.
  2. Confirm pipe size/system: identify 40mm vs 32mm and whether existing black pipe is solvent-weld, push-fit or compression-compatible.
  3. Clear downstream waste: before rebuilding, prove the main outlet is not partially blocked. A shared drain can leak at many joints if water backs up.
  4. Use a proper shared manifold: replace improvised/misaligned branches with a neat 40mm waste manifold/tees with accessible compression unions.
  5. Maintain fall: horizontal waste should fall continuously towards the outlet. Avoid dips that hold water and sludge.
  6. Support the pipework: add clips/brackets so appliances and hoses are not hanging off compression joints.
  7. Give each appliance a safe connection: glasswash hose to a proper hose spigot/standpipe; sink via its trap; ice machine via manufacturer-approved drain with air gap/tundish where required.
  8. Keep service access: fit clean-out/rodding access and avoid burying joints where staff cannot see leaks.
  9. Replace worn seals: use new compression washers, trap seals and hose clips throughout the rebuilt section.
  10. Test in stages: run sink, glasswash discharge and ice machine drain separately, then together. Photograph dry joints after testing.

Important note

Ice machine drain hygiene

  • Ice machines should normally drain without risk of dirty waste water backing into the machine.
  • Do not create a sealed direct connection to foul waste unless the machine/manual/plumber confirms it is correct.
  • A trapped tundish/air gap or open standpipe arrangement is often used so backflow is visible and cannot contaminate the appliance.
  • If smells, slow drainage or gurgling occur, investigate the trap/vent/downstream blockage rather than just tightening joints.

Do / don’t

Staff-safe checks

  • ✅ Dry everything and use tissue to find the first wet point.
  • ✅ Run one appliance/source at a time.
  • ✅ Hand-tighten compression nuts, then only a small extra nip.
  • ✅ Replace washers rather than repeatedly tightening old fittings.
  • ✅ Keep electrical items and extension leads away from water.
  • ❌ Do not rely on PTFE tape around compression threads; the washer does the sealing.
  • ❌ Do not silicone over a leaking compression joint as the main repair.
  • ❌ Do not force pipework sideways to make it reach.

When to call plumber/engineer

Escalate if...

  • More than one joint leaks after reseating washers.
  • Water backs up when glasswash drains.
  • The main black waste pipe is blocked, cracked or poorly supported.
  • Pipe size/system is unclear or mixed.
  • There is any risk of drain water backing towards the ice machine.
  • The floor leak is near electrics, fridges or appliance plugs.

Photo / video evidence

Current drain evidence

Videos are compressed and visual-only for phone viewing. They do not autoplay.

Bunk Lower Parliament shared drain pipework and wet floor below ice machine, sink and glasswash area
Overview: shared under-counter drain area with visible water on the floor and multiple connected waste branches.
Moved here from the Loughborough sink page: close-up of the Lower Parliament shared drain/trap compression pipework. Use tissue around each nut to identify the first leak point.
Additional close-up visual evidence of wet compression fittings/joint area.
Wider inspection clip showing the shared pipework/appliance area. Audio removed because the issue is visual leakage, not sound.

Engineer handover

Copy/paste brief

Use this when sending the job to a plumber/maintenance engineer.

Site details

Venue
Bunk Lower Parliament
Address
Lower Parliament Street / Nottingham area — exact address to confirm before dispatch
Asset
Shared drain/waste pipework for ice machine, sink and glasswash area
Issue
Water leaking from more than one point around shared waste system.
Likely parts
40mm waste compression washers, trap kit, swept tees/manifold, appliance hose spigots/adaptors, pipe clips/supports, possible new black waste pipe section.
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