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Back-inlet gully
— Gully with a side inlet allowing waste pipes to connect below grating level.
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Back-to-wall toilet
— Toilet pan that sits flush against a wall hiding pipework with a separate concealed cistern.
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Backflow preventer
— Device protecting drinking water from contamination by reverse flow from connected appliances.
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Bad smell from drain
— Unpleasant odour rising from a drain or fitting, usually indicating a trap or seal problem.
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Ball valve
— Quarter-turn valve using a perforated ball to control or shut off the flow of water.
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Bank holiday drainage callout
— Drainage emergency response on UK bank holidays, with premium charges typically applied.
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Bath
— Large sanitary fitting for bathing supplied by taps and discharged through a waste and trap.
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Bath overflow
— Upper outlet on a bath that prevents flooding by draining away water above a set level.
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Bath waste
— Waste fitting at the foot of a bath connecting the outlet and overflow to the trap.
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Belfast sink (Butler sink)
— Deep ceramic kitchen sink with a rectangular bowl traditionally used in utility areas.
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Bell trap
— Older style gully trap with a dome-shaped cover sitting in a water seal pocket.
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Bidet
— Low ceramic basin for intimate washing supplied by taps and discharged through a waste.
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Block of flats (managed)
— Multi-unit residential block under management with shared stacks and communal drainage.
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Blocked drain
— Partial or full obstruction in a drain pipe preventing normal wastewater flow.
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Bottle trap
— Compact cylindrical trap used under basins where space is limited.
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Bowl waste
— Threaded fitting connecting the outlet of a sink or basin to the trap and waste pipe.
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Branch drain
— Smaller drain pipe connecting an individual appliance or fixture to the main drain run.
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Branch drain survey
— CCTV inspection of a branch drain serving a single fitting or small group of fittings.
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BS 6700 (water supply systems)
— Historic British Standard giving design and installation guidance for cold and hot water services.
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BS 8000-14 (workmanship)
— British Standard giving workmanship requirements for drainage installation on site.
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BS 8580 (legionellosis risk)
— British Standard giving guidance on risk assessment for legionellosis from water systems.
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BS EN 12056 (gravity drainage inside)
— European Standard for the design of gravity drainage systems inside buildings.
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BS EN 13476 (PVC-U pipes)
— European Standard for unplasticised PVC pipes and fittings for non-pressure underground drainage.
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BS EN 14457 (CCTV survey)
— European Standard providing general requirements for components of drain and sewer systems.
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BS EN 1610 (pipe installation)
— European Standard for the construction and testing of drains and sewers.
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BS EN 1671 (vacuum sewerage)
— European Standard for the design and construction of vacuum sewerage systems outside buildings.
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BS EN 274 (waste fittings)
— European Standard for sanitary tapware waste fittings, including traps, plugs and overflows.
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BS EN 752 (drainage outside buildings)
— European Standard for design and construction of drain and sewer systems outside buildings.
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Build-over agreement
— Sewerage undertaker consent for construction over or close to a public sewer.
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Building Act 1984
— Primary UK legislation that provides the legal framework for Building Regulations.
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Building Regulations Part H
— Statutory rules governing drainage and waste disposal in UK new builds and works.
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Burst water pipe emergency
— Urgent response to burst supply or waste pipes flooding property, requiring isolation and repair.
