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5 Year Warranty
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Fig 256A Pipe Interrupter

5 Year Warranty
Buy Online Price from £52.27 (ex vat)

The NABIC Fig 256A pipe interrupter is classified as a type DC device suitable for protecting up to fluid category 5.

Incorporating ventilation ports that are totally unrestricted and permanent, water is guided past these air vents using a venturi type nozzle. Since they are open to atmosphere this stops siphonage and allows the escape of water in the event of backflow.

  • O Rings EPDM
  • In compliance with: BS EN1717 & BS EN 806-5



Product Features +

Medium: Water

Size Range: DN10 - DN20

Pressure: 0 - 10 bar

Material: Chrome Plated Brass

Temperature: -20 to 60°C

Connection: Male inlet and outlet

Pipe Connections

Male BSP inlet and outlet connections: G3/8", G1/2" and G3/4" to ISO228A.


All valves are 100% production tested.


1 Body Material Brass
2 Internals Plastic
3 'O' Ring Seals EPDM


Dimensional Drawings

NABIC 256A Dimensional Drawing

Dimensions & Weights

L D Kv
10 3/8" 83.5 30 0.33
15 1/2" 91 43.5 0.9
20 3/4" 88 43.5 1.14


Downloads +

BIM Library

Buy Online +

Fig 256A Pipe Interrupter

  • Online ordering is only available in the UK and Northern Ireland
  • Orders placed before 2pm Monday to Thursday will be delivered next working day
  • Orders placed before 10am on Fridays will be delivered on Monday
  • Customers can order up to 12 of any one product line. For larger orders please call us on 01462 443 278
  • Order over £400 for Free Next Day Delivery
  • Due to the COVID-19 pandemic orders may take a little longer to deliver than usual.

View Delivery, Returns & Refunds Details


Part Number Size Ex Vat Stock Status More
DN15 £ 52.27 In stock +
G 1/2" Male Inlet and Outlet to BS EN ISO 228-1. Low flow. Suitable for protecting up to fluid class 5
DN20 £ 55.13 In stock +
G 3/4" Male Inlet and Outlet to BS EN ISO 228-1. Suitable for protecting up to fluid class 5

Price £52.27


What our customers say

We had an existing NABIC Fig. 500 safety valve installed in our steam boiler factory which needed replacing. The valve had started to leak due to its old age.

I had no hesitation in purchasing another as it’s been a great product. I was very happy with the service of the website, as well as the prices. The fact the valves come with the necessary certifications is also great.

Wayne Barnes- Engineering Co-ordinator, Newlywed Foods

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