The 1000/551 anti-siphon adaptor is a Type DC Device* that can be fitted to most standard laboratory taps that have a removable nozzle with a 1/2″ BSP thread. The fitting of this device gives the tap an AUK3** air gap to prevent backflow.
The regulations state that all laboratories are potentially category 5 high risk contamination areas and as such all taps have the requirement for the prevention of backflow siphonage to be fitted.
To fit the new Monmouth anti-siphon adaptor, simply unscrew the existing nozzle and screw the anti-siphon adaptor in to it’s place. Then refit the nozzle to the anti-siphon adaptor.
*”Type DC – Pipe interrupter with permanent atmospheric vent” means a non-mechanical backflow prevention device with a permanent unrestricted air inlet, the device being installed so that the flow of water is in a vertical downward direction.
**Type AUK3 – Higher risk tap gap” means the height of an air gap between the lowest part of the outlet of a tap, combination fitting, shower head or other fitting discharging over any appliance or other receptacle, and the spillover level of that appliance, where a fluid category 4 or 5 risk is present downstream,
- For further information please consult the Water Supply (Water Fittings) Regulations 1999
It is important that prior to purchase you fully understand the implications of a tap with this air gap.
This tap needs to be installed ideally with a pressure and flow restrictor (not supplied) inline before the tap. If flow or pressure in the system is too great or the tap sees back pressure in any situation then the DC Type anti-siphon adaptor will ‘leak’ through the side of the tap. This is normal and is doing what the device is intended to do. It means that whilst the tap has a hose tail fitted to the nozzle, it cannot be connected to any further device that attempts to control the flow further downstream. This unit prevents back pressure being created and therefore eliminates the possibilities of contamination of the water supply.
Use of this product will require the water flow and pressure to be kept to a minimum by the fitting of a pressure/flow reducer upstream of the tap.