Close this search box.

Business Accounts Available

SaleFree DeliveryWilhelmsen Brand Logo

Wilhelmsen Unitor W-66S Acetylene Flashback Arrestor – 19 m3/h 183970

SKU: 183970
  • Stops the pressure front and flame front.
  • Stops gas from back feeding into the system.
  • Prevents fire from being supported by gas.
  • Signal lever will show if the pressure sensitive cut-off has been activated; the lever is also used for resetting the flashback arrestor.

Original price was: £1,146.72.Current price is: £764.48. ex. VAT     £917.38 inc VAT

Worldwide Delivery
Rated excellent on Google
Over 50 years welding expertise
Free delivery over £85 inc. VAT

Quantity discounts available – Click Here

Checkout securely
Finance available

Buy Now, Pay Later In 3 Interest-Free Payments​


The Wilhelmsen Unitor W-66S Acetylene Flashback Arrestor is a safety device that prevents flashbacks from occurring during gas welding. Flashbacks can occur when a flame travels back through the hoses and into the regulator or cylinder, which can lead to an explosion or fire. The W-66S flashback arrestor works by interrupting the flow of gas if a flashback occurs, preventing the fire from spreading.

The W-66S flashback arrestor is made of high-quality materials and is designed to withstand the harsh conditions of gas welding. It is also easy to install and use. The W-66S flashback arrestor is a valuable safety device for anyone who uses gas welding equipment.

Note. For safety, we recommend annual testing and replacement of flashback arrestors every 5 years, in line with COSWP UK, OCIMF SIRE, and RIGHTSHIP RISQ requirements.





  • BAM-certified and OCIMF/RIGHTSHIP-compliant
  • Pressure sensitive cut-off valve to prevent further gas supply after a flashback (activated by the pressure shock in front of the flashback).
  • Temperature activated cut-off valve to prevent further gas supply in case of fire (activated if the temperature rises to approximately 100° C).
  • Flame filter/arrestor to quench the flame front of a flashback or a burn back.
  • Non-return valve for preventing reverse flow of gases, thereby preventing a gas mixture from reaching pipelines or cylinders.
  • Resettable.
  • Marking of manufacturing date and serial number for traceability.


Additional information
Free Delivery

Free Delivery




Click and Collect:
Free Click and Collect with no minimum spend from our warehouse on the Empress Park, Southampton with on-site parking. Once your order has been processed, we will advise you when it is ready for pickup.  Just want advice?  No problem.  Feel free to call in to speak to one of our friendly experts.

EWS Fleet Coverage Areas: 
Southampton | Eastleigh | Winchester | Alton | Farnham | Petersfield | Havant | Hayling Island | Waterlooville | Fareham | Portsmouth | Gosport | Chichester | Arun | Worthing | New Forest | Christchurch | Salisbury | Wiltshire | Test Valley | Basingstoke and Deane | West Berkshire | Reading | Hart | Waverley | East Hampshire | East Dorset | Hampshire | Bournemouth | Poole | Lymington | Ringwood | Verwood | East Preston | Goring-by-Sea | Lancing | Shoreham-by-Sea | Steyning | Bramber | Horsham | Adur

Nationwide Delivery (all items excluding gas cylinders):
Free UK mainland (England, Scotland and Wales) delivery on orders over £85 inc. VAT.
UK mainland delivery is £7.50 inc. VAT on orders under £85 inc. VAT.
UK islands and Northern Ireland shipping costs may vary.

UK Delivery for Gas Cylinders:
Shipping costs for gas cylinders are calculated at checkout once the delivery postcode is entered.

International Delivery:
Please contact us for an accurate delivery quote.


Technical Data

Operating pressure [bar] 1.5 maximum
Capacity 19 m3/h
Wilhelmsen Unitor W-66S Acetylene Flashback Arrestor - 19 m3/h 183970

Wilhelmsen Unitor W-66S Acetylene Flashback Arrestor – 19 m3/h 183970

Rated 0 out of 5
Original price was: £1,146.72.Current price is: £764.48. ex. VAT     £917.38 inc VAT
0 items Cart
My account

We'd Love Your Feedback

Before you go, please let us know how we can improve your experience.

Website Feedback

Did you find what you were looking for?
If you answered yes, did you place your order?
This field is for validation purposes and should be left unchanged.