Flomasta Brass Shank Bottom Entry Air Gap Cistern Inlet Float Valve
The Flomasta Brass Shank Bottom Entry Air Gap Float Valve is an upgraded, heavy-duty replacement fill valve engineered for domestic toilet cisterns. Featuring a solid 1/2" BSP brass tail, it eliminates cross-threading and overtightening risks commonly associated with plastic shanks. Built with an integrated AG type air gap compliant with BS 1212-4 and UK Water Supply (Water Fittings) Regulations, it provides physical backflow protection to stop cistern water siphoning into drinking mains. The unit includes an adjustable telescopic height column and precise float level screw to suit low- and high-pressure ceramic and plastic cisterns.
Identification Guide:
Brand: Flomasta | Inlet Position: Bottom Entry (BE) | Thread / Shank: 1/2" BSP Solid Brass | Backflow Prevention: Type AG Air Gap (BS 1212-4) | Pressure Rating: 0.2 bar – 16 bar | Suitability: Universal Bottom-Feed Cisterns
Key Features
- Solid Brass Threaded Shank: Robust 1/2" BSP brass tail prevents stripping, cross-threading, or cracking during mechanical pipe connection.
- Type AG Air Gap Protection: Built-in spill-over weir provides certified backflow prevention, keeping potable mains water safe from siphonage.
- Telescopic Height Adjustment: Sliding stem extends easily to match specific cistern water levels and tank depths without cutting.
- Quiet, Rapid Refill: Engineered delayed-action diaphragm filling reduces water hammer, filling noise, and valve vibration.
- Pressure Versatility: Operates smoothly across both low-pressure gravity tanks (from 0.2 bar) and high-pressure mains systems (up to 16 bar).
Installation & Fitting Guidance
Designed strictly for cisterns where the water supply enters through the underside base hole. Ensure the cistern overflow weir is set at least 25mm below the valve's air gap spill slots to maintain full water regulation compliance. Flush incoming pipework to remove solder residues and grit before connecting the brass shank to preserve the internal filter mesh.