R&T A1423 G1/2" Side Entry Toilet Cistern Inlet Fill Valve — AF042700-0008
The R&T A1423 (AF042700-0008) is an authentic OEM side-entry float fill valve manufactured by R&T Plumbing Technology. Widely installed as factory-fitted equipment across leading UK and international bathroom suites, this valve features a standard UK G 1/2" (1/2" BSP) male threaded shank. Engineered with a hydraulic pilot diaphragm mechanism, it delivers smooth, quiet water refill and an instant shut-off to eliminate cistern hiss, water hammer, and continuous overflow passing.
Identification Guide:
MPN: AF042700-0008 | Model Series: A1423 | Manufacturer: R&T (Xiamen R&T Plumbing Technology) | Inlet Orientation: Side Entry (Horizontal cistern wall mount) | Thread Specification: G 1/2" Male (approx. 20.5mm–20.9mm outer thread diameter — standard UK tap connector feed) | Working Pressure: 0.2 bar to 16 bar | EAN / Barcode: OEM Bulk / Does Not Apply.
Key Features
- Standard UK G 1/2" Thread: Connects directly to UK standard 1/2" flexible tap connectors, service valves, and pipe fittings without adapters.
- Hydraulic Diaphragm Shut-Off: Pilot-operated mechanism provides crisp, clean shut-off and prevents pipe shudder and water hammer shock.
- Quiet Water Refill: Low-noise hydraulic internal flow path significantly reduces refilling sounds compared to traditional brass-arm ball valves.
- Anti-Siphon Backflow Design: Integrated air gap structure prevents cistern water from siphoning back into your clean domestic water supply.
- Precision Level Adjustment: Threaded adjustment rod enables effortless, accurate waterline calibration inside the cistern.
- Removable Silt Strainer: Built-in internal mesh filter protects the diaphragm seal from grit, limescale, and pipe sediment.
Installation Note
This valve features a standard UK G 1/2" (1/2" BSP) thread (measures approximately 20.5mm to 20.9mm outside diameter across the threads). It will not fit European 3/8" BSP connections (approx. 16.6mm OD). Suitable for side apertures on either the left or right side of close-coupled, low-level, or plastic cisterns. Seat the conical rubber washer on the inside of the tank wall and tighten the external backnut hand-tight plus half a turn with a spanner.