The Wirquin Jollyfill Air Side Entry Brass Inlet Valve 1/2" (Manufacturer's Part Number: 10120694) is a premium, high-specification toilet cistern fill valve known for its quiet operation, water-saving features, and robust construction. 
Key Features and Specifications
1/2" Brass Inlet: Features a durable, high-quality brass tail connection (1/2-inch BSP thread size), which is preferred by trade professionals for its longevity and secure fitting that resists cross-threading.
AUK1 Air Gap Compliant: The "Air" in the name refers to its advanced design which meets all AUK1 Air Gap requirements, completely eliminating the risk of backflow and ensuring compliance with UK water regulations (WRAS/KIWA Reg4 approved to BS1212-4).
Ultra-Quiet Filling: This valve is exceptionally quiet, operating at just 17 decibels (dB), making it ideal for use in modern homes where noise reduction is important.
Water-Saving Delayed Action: The intelligent float uses delayed action technology to ensure the cistern only begins refilling after the flush cycle is complete, saving an average of 6 litres of water per day for a family of four compared to older models.
Wide Pressure Range: Suitable for both low and high-pressure water systems, functioning effectively from 0.1 bar up to 16 bar, and resistant to pressure peaks up to 20 bar.
Compact and Adjustable:
It has a 180° rotating head, allowing the position of the water discharge to be changed to suit compact or narrow cisterns where space is restricted.
The float housing is designed to be anti-fouling, preventing the float from snagging on the cistern walls or outlet valve.
Proven Durability: The valve is endurance tested to 200,000 fill cycles and comes with a 10-year guarantee, reflecting its professional-grade reliability. 
This valve combines professional-grade materials with modern water-saving and safety features, making it a reliable choice for installers.