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Tipper truck (waste removal)
— Vehicle used to remove excavated material and bulky drainage waste from site.
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Toilet overflow emergency
— Urgent response to overflowing WC from blockage downstream, requiring rapid clearance.
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Toilet pan (WC pan)
— Ceramic bowl of a toilet that receives waste and discharges to the soil pipe.
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Toilet paper blockage
— Drain blockage from excessive toilet paper that has not dispersed before reaching the main drain.
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Toilet seat
— Hinged seat fitted to a toilet pan providing a comfortable surface for the user.
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Toilet won't flush
— Toilet that fails to clear the pan, caused by blockage, cistern fault or weak flush mechanism.
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Trailer-mounted jetter
— High-pressure jetter mounted on a road trailer for site use.
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Trap connection (32mm, 40mm, 50mm)
— Threaded inlet on a trap matching standard waste pipe sizes used in UK plumbing.
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Trapped gully
— Gully fitted with a water seal trap to prevent drain odours rising to the surface.
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Tree root emergency
— Emergency response to drain blockage from tree root intrusion causing flooding or backup.
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Tree root intrusion
— Tree roots entering a drain through joints or cracks, restricting flow and damaging pipework.
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Trench box
— Welded steel box lowered into a trench to provide a safe working chamber.
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Trench shoring kit
— Modular boxes or panels installed in a trench to prevent ground collapse.
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Trenchless excavation
— Drainage repair carried out without opening a continuous trench along the pipe run.
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U-bend (P-trap, S-trap)
— Curved pipe section holding water to block drain odours rising into the room.
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Universal pan connector
— Flexible fitting that joins a toilet pan to the soil pipe accommodating offsets and angles.
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Urinal
— Wall-mounted sanitary fitting used by men in commercial and public washrooms.
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UV cure lining
— CIPP lining cured using ultraviolet light drawn through the inflated liner.
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Vacuum tanker (high suction)
— Tanker vehicle that uses high suction to remove liquid and silt from drains.
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Vacuum test (drain)
— Test using applied vacuum to check watertightness of manholes and inspection chambers.
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Van-pack jetter
— Jetter unit built into a light commercial van for mobile drainage works.
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Vanity basin
— Wash basin set into or mounted on top of a furniture unit providing storage below.
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Veterinary practice
— Animal healthcare premises with sluice drainage, sharps risk and infection control.
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Victorian terrace
— Terraced house built between 1837 and 1901, typically with original clay drainage.
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Vinyl ester resin (CIPP)
— Chemically resistant CIPP resin used for industrial drainage and aggressive effluent.
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Vitrified clay (Hepworth brand)
— Branded UK vitrified clay pipe system widely specified in modern foul drainage installations.
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Vitrified clay pipe
— Fired clay drainage pipe widely used in UK foul drainage for over a century.
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Wall-hung toilet
— Toilet pan fixed to the wall with a concealed cistern and no contact with the floor.
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Warehouse
— Storage and distribution building with limited foul drainage but extensive surface water.
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Wash basin
— Sanitary fitting for washing hands and face with tap and waste connections.
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Waste pipe
— Smaller diameter pipe carrying water from sinks, baths and basins to the drainage system.
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Water backup (overflow from fixture)
— Wastewater backing up out of a sink, bath or toilet due to drain blockage.
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Water Industry Act 1991
— Primary UK legislation governing the duties and powers of water and sewerage undertakers.
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Water pooling on lawn
— Standing surface water on a lawn after rain, often linked to blocked or undersized drainage.
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Water Resources Act 1991
— Primary UK legislation governing water abstraction, pollution prevention and watercourses.
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Water seal
— Layer of water retained in a trap that prevents drain odours entering a building.
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Water Supply (Water Fittings) Regs 1999
— UK regulations setting out requirements for water fittings to prevent waste and contamination.
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Water test (drain)
— Pressure test using a controlled head of water to check drain watertightness.
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Watersafe registration
— UK accreditation scheme for plumbers and businesses competent to work on water supply systems.
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Weekend drainage service
— Drainage emergency response on Saturdays and Sundays at premium callout rates.
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Wet patch on ceiling
— Damp staining on a ceiling caused by water leaking from drainage or supply pipework above.
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Wet room
— Fully waterproofed bathroom with an open shower area and a floor drain.
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Wet wipe blockage
— Drain blockage caused by flushed wet wipes that do not break down in water.
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WIAPS (Water Industry Approved Plumbers Scheme)
— Historic UK plumbing accreditation scheme, now consolidated within Watersafe.
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Working at Height Regulations 2005
— UK regulations setting out duties to prevent falls from height, including roof drainage works.
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WRc condition grading
— Industry standard scheme that grades drain defects from 1 (minor) to 5 (severe).
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WRc Sewer Cleaning Manual
— UK industry reference giving guidance on sewer cleaning techniques and equipment.
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WRc Sewerage Manual
— UK industry reference manual covering sewerage design and asset management practice.
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Yard gully
— Surface drainage point in yards and paved areas connecting run-off to the drain.
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Yard gully unblocking
— Clearance of a yard or area drainage gully and its outlet to restore drainage.
