5 Year Warranty
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Fig 256A Pipe Interrupter

5 Year Warranty
Buy Online Price from £41.45 (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.

  • DN15 & DN20 WRAS approved to be used on all potable water applications
  • 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 +
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 5 of any one product line. For larger orders please call us on 01462 443 278
  • Order over £400 for Free Next Day Delivery

View Delivery, Returns & Refunds Details


Part Number Size Ex Vat Stock Status More
DN10 £ 41.45 In stock +
G 3/8" Male Inlet and Outlet to BS EN ISO 228-1. Suitable for protecting up to fluid class 5
DN15 £ 47.52 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 £ 50.12 In stock +
G 3/4" Male Inlet and Outlet to BS EN ISO 228-1. Suitable for protecting up to fluid class 5

Price £41.45

You must select a value for all options provided.


What our customers say

After an insurance recommendation I decided to replace one of our Safety Relief Valves. Working within the pharmaceutical industry, the valve was required for hot water calorifier.

The service on the site was great and I liked the fact that the certifications arrive with the products. We at Bayer have limited access to wholesalers, buying direct from NABIC using a bank card proved to be a much easier transaction.

Chris Green, Bayer

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