Challis Ag+ Sentinel Valve™
Kills 99% Legionella, Pseudomonas, E coli*
"The facemask for taps"
*Independent Testing ASTM E 2149-20
How to Protect Your Tap Outlet From Pseudomonas & Legionella
Various reports over recent years have identified tap outlets and diffusers as a primary source of biofilm build up and subsequent proliferation of micro organisms such as Pseudomonas Aeruginosa and Legionella in tap diffusers and tap spouts.
This proliferation seems to be caused by two factors. Firstly the restriction of flow through diffusers and aerators encourages the build up of biofilm. Secondly the aeration effect of the aerator diffusers combined with splash back from the sink and drain hole facilitates vapour contamination of the tap outlet and subsequent back contamination of the tap spout.
Over the last few years various manufacturers have developed innovative, imaginative, complicated and expensive solutions to these problems. From dramatic re-design of the sink, re-positioning the sink drain, right through to the complete re-design of the wash station with UV and digital readout. All these concepts overlooked the fundamental simplicity of the problem; how to prevent contaminated aerosol from back contaminating the tap outlet?
Why not physically seal off the outlet when it's not being used?
This is where Challis Ag+ simple approach to any problem resulted in a cost effective simple solution in the form of our patented Challis Ag+ Sentinel Valve™. Our simple tap insert replaces the internals of your current tap diffuser. The Challis Ag+ Sentinel Valve™ is designed to enable the outlet to stretch open when water flow passes through and then seals shut when water flow ceases.
This innovative action means that the tap outlet is effectively closed and sealed when the water flow ceases, preventing any back contamination of the tap outlet or spout, by aerosols.
A simple cost effective solution that can be quickly and easily retro fitted to any Tap, providing 24/7 anti microbial protection across your estate.
The Challis Ag+ Sentinel Valve™ is made from Food/ Medical grade Silicone which has the following properties:
Antimicrobial additive protection reducing risk of bacterial growth
High steam sterilisation resistance so can be autoclaved
Colour Coded (coming soon) to support improved compliance management
Patented Sentinel™ wire mesh 'bullet' providing additional antimicrobial properties
Excellent bio-compatibility already widely used in hospitals and medical devices such as catheters, implants and surgical reconstructive components.
Low chemical reactivity so can be safely cleaned with the broadest range of chemicals
Superior resistance to heat and cold -30ºC to +350ºC
Durable with a high flex fatigue resistance for a long working life
High limescale resistance preventing biofilm build up
Biofilm build-up on a tap-diffuser
No biofilm build-up on Sentinel™ mesh
Challis Ag+ Sentinel™ Valve.
How Does It Work?
Sillicone 'O'Ring for use with
M22 & M21.5 Adaptor
M22 (external) & M21.5 (external)
M24 (external) & M22 (internal)
Chrome Plated Shroud
M24 (internal) & M22 (internal) Chrome Plated Adaptor Ring