We will be closed 19th June 2021 - 28th June 2021

CustomDuo Modules


LED upgrades for Petzl Duo 

CustomDUO Shop


The Rat is back ! Single regulated power setting. Same XP-G3s LED as Omni v42 and Omni Simple modules, with foward bias flood optic. Choice of 5000k, 170 lumen or 3000k, 164 lumens. 6 hours typical operation using NiMh AA batteries. Super easy fitting. Well suited to novices, activity group use, etc etc! Available individually, or discounted multi pack. 


£30 or £90 (pack of 4)     

Petzl Duo Fixo Screws

5 off large head fixing screws for helmet mounting Petzl Duo.



Bargain Bazaar

CustomDUO Shop 

The Online Shop allows payment with most debit and credit cards, without the requirement for a Paypal account. Add product to cart and option is offered at checkout. Customduo also accept UK cheque or bank transfer.  International orders welcome. We are currently shipping internationally (outside UK) at no extra postal charge. For more details please see delivery


Please note that we are a small manufacturing business. Officially we work Mon-Thurs (excluding public holidays). If closed for holidays etc we will provide notice on CustomDUO calendar.

We aim to despatch CustomDUO stock products within two working days, and generally the next working day. We make every effort to keep our on-line stock availability right up to date (and generally don't get caught napping). When placing an order, please ensure that your delivery details are correct, and also that your email address is current, so that we can keep you informed on order progress.


Before purchasing any Customduo product please ensure that you have read and accept the terms

Petzl Duo Oval Lens

Petzl Duo oval lens (Petzl Duo lamp front window).




Petzl Duo front window

Petzl Duo Battery Holder 

Petzl Duo replacement battery holder and lid. 




Petzl Duo Battery Box

Petzl Duo  

Petzl Duo, modified to helmet fixing caver specification, and ready for Customduo LED conversion module (available seperately). Original reflector / bulbs removed. Supplied with helmet fixing screws. New lamps £80, and very good condition nearly new units from £50. Intermittant stock depending on current availability. 


£50 - £80    contact us


Current stock Nov 2020 (not always accurate) - 1off NEW £80 


v42 Remote Control Programmer

Remote controller, configured for v42 module. Allows super easy configuration of light settings. Requires CR2025 battery (not included). Compatible with Rude Nora 3-dive caving lights. 


£5   (available at discounted price £2.50 when purchased with module - see v42 listing above)

v42 Remote Programmer

Petzl Duo Headband

Genuine Petzl Duo headband in 2 pieces. Not a universal headband. With 2x grey plastic cable clips. Intermittant stock availability. (Please do not order more than 1 of these without first contacting us to check current stock level).




Sorry, currently out of stock      

Petzl Duo Battery Box Clasps

Aluminium Petzl Duo battery box clasps (pair). Increasingly hard to source. New or used good condition, as available. (Please do not order more than 1 pair of these without first contacting us to check current stock level).


£12 - £18


Sorry , currently out of stock      

Basic (r01)

v42 (r02)

Latest version of our bench mark v42 insert for Petzl Duo. Now with 5 green indicator LEDs, for battery charge level indication / programming , and new integrated alloy heatsink. 4 light settings plus low output 'camp' setting. Up to 9 configurable settings. Simple user friendly remote control programming. Spot and flood LEDs, 620 lumen, plus side LED. 


Limited edition Hybrid version now available, with 5000k spot and 3000k flood.


£70   (optional remote programmer +£2.50)                          






Simple (r02)

Simple, no frills version of the v42 module. Now featuring two main LEDs (spot and flood), and new integrated alloy heatsink. 3 fixed level power settings, plus low output 'camp' setting and battery charge level indication. Very effective, 340 lumen. 



v42 (r02)
Simple (r02)