NIS Mechanical In-Wall Concealed Cistern Dual Flush Valve
The NIS Mechanical In-Wall Frame Dual Flush Valve is the genuine replacement drop valve designed specifically for NIS (Nison) concealed cisterns and wall-hung mounting frames. Engineered for direct mechanical rod/lever actuation from the front flush plate, this heavy-duty valve replaces worn, passing, or degraded internal mechanisms to restore accurate full and half flushing performance without requiring alterations to the in-wall carrier frame.
Identification Guide:
Brand / Manufacturer: NIS (Nison Plastic) | Cistern Type: In-Wall Concealed Cisterns & Wall-Hung WC Frames | Operation: Mechanical Push-Rod / Lever Actuation (Not Cable / Not Pneumatic) | Flush Function: Dual Flush (Full & Water-Saving Reduced Flush) | Maintenance Access: Serviced directly through the front flush plate aperture.
Key Features
- Direct Mechanical Actuation: Designed specifically for rigid rod/bracket linkage systems behind NIS front-mounted push plates.
- Slimline Concealed Profile: Sized specifically to insert and extract cleanly through standard in-wall flush plate inspection openings for maintenance.
- Adjustable Flush Volumes: Integrated volume sliders allow precise tuning of both full and reduced flush settings to optimise water efficiency.
- Twist-Lock Bayonet Connection: Direct twist-fit into the pre-installed NIS base cradle inside the tank, eliminating the need to disturb structural pipework.
Installation & Compatibility Advice
Important Verification: This is a mechanical flush valve operated by push-rods from the flush plate. It is not interchangeable with cable-operated or pneumatic air-hose systems. To service or replace, shut off the water supply, remove the front flush plate and internal splash guard, unhook the mechanical actuation bridge, and twist the valve body 90 degrees counter-clockwise to lift it clear of the base basket.