UK trade guideTap Spares 5 min readUpdated 9 July 2026

How to Fit a Monobloc Mixer Tap (UK)

Install a single-hole monobloc kitchen or basin mixer. Isolation, flexi tails and Water Regs compliance.

BristanGroheFrankeReginox

Pre-fit

Fit isolation service valves at the hot and cold feeds beneath the sink. 3/8" or 1/2" female inlet.

Fit

Rubber sealing washer above sink deck, brass mounting plate below, retaining stud tightened evenly. Connect flexis with hand-tight + ¼-turn on the isolator side.

Frequently asked questions

Do monobloc taps need single check valves?
Yes — Water Regs 1999 Fluid Category 3 protection required on any mixed-flow tap.
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