2.1/2", 3" & 4" are a stock item. Order by 5pm for Sameday despatch..
The Honeywell BS300 backflow preventer is suitable for protection against back pressure, backflow and back siphonage for fluids upto category 4.
We have an interesting article relating to Backflow Prevention in the Technical section on this website.
Honeywell BA300 Class 4 Backflow Preventer RPZ Valve Datasheet
WRAS Approved Installation Method for RPZ Valves
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10 Barg Max (145 Psig Max)