Emergency Plumber Sligo — Technical Glossary

Plain-English glossary of 15 emergency plumbing, stopcock, hot press cylinder and oil boiler terms for Sligo homeowners.

15 key terms explained

Mains Water Stopcock

The brass screw-down or quarter-turn isolation valve (usually under the kitchen sink) that shuts off high-pressure cold mains water entering the house.

Wheel-Head Gate Valve

Red wheel-handled brass valve in the hot press that isolates the low-pressure cold water gravity feed coming down from the attic storage tank.

Full-Bore Lever Ball Valve

Modern quarter-turn shut-off valve with a vinyl-coated lever handle that isolates a pipe cleanly with a 90-degree turn without seizing.

Vented Copper Hot Water Cylinder

Factory-lagged copper cylinder in the hot press heated by an internal boiler coil and a top-mounted electric immersion element.

Dual Immersion Heater (Sink / Bath)

Top-entry electric heating unit with a short element for heating the top of the cylinder and a long element for heating the whole tank.

Incoloy Immersion Element

Corrosion-resistant alloy immersion element suited to harder or private-well water supplies across rural County Sligo.

Riello Oil Burner Lockout

Safety shutdown on an oil-fired boiler triggered when the photocell fails to detect a flame due to an airlock, blocked nozzle or dirty fuel filter.

Photocell (Flame Sensor)

Light-sensitive sensor inside an oil boiler burner head that watches the flame and shuts off the fuel solenoid if ignition fails.

Tigerloop Oil De-Aerator

Automatic air-eliminator fitted beside an oil boiler that removes air bubbles from a two-pipe or single-pipe kerosene supply line.

Central Heating Circulating Pump

Electric wet-rotor pump (typically 6-metre head) that pushes hot water from the boiler through the radiator circuit and cylinder coil.

2-Port Motorised Zone Valve

Electrically actuated brass valve in the hot press controlled by room and cylinder thermostats to direct heat to upstairs, downstairs or hot water.

Sealed System Expansion Vessel

Red steel vessel containing a pressurised air diaphragm that absorbs the expansion of heated water in a sealed central heating circuit.

Pressure Relief Valve (PRV — 3 Bar)

Safety valve on a sealed boiler system that opens at 3 bar to discharge excess pressure safely through an outside copper overflow pipe.

Push-Fit & Compression Couplings

Brass compression rings and WRAS-approved barrier-pipe fittings used to repair split or leaking 15mm, 22mm and 28mm domestic pipes.

Closet Auger

Flexible vinyl-guarded steel cable tool designed to pass through a toilet pan trap and clear a blockage without scratching the porcelain.