This is a stock item. Order by 5pm for Sameday despatch.
The Fig 256B is classified as a DB type suitable for protecting up to fluid category 4. This device has a moving element which seals the ventilation gaps during normal flow conditions. When negative pressures occur on the inlet side which could cause siphonage, the membrane retracts seals the flow ports and simultaneously vents the outlet side of the pipe interrupter. We have an interesting article relating to Backflow Prevention in the Technical section on this website.
Nabic Fig 256B Pipe Interrupter Datasheet
Nabic Fig 256B Installation, Operating and Maintenance Instructions
Nabic Fig 256B Pipe Interrupter WRAS Certifcate
Full Nabic Product Brochure
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10 Barg Max (145 Psig Max)