Bakelite plug

[bloome]

Hello all.

Does anyone know what this bakelite part is used for?
It has internal thread and is aprox 65mm long.
Me is told used at 25 pounder ammunition but i have no information, to me it has more to do with bombfuzes uk.

Thank you for all information.

 

[Snufkin]

A Mk IX rectifier (from the markings), akin to the Mk VIII rectifier supplied with No.27 detonators:

https://www.bocn.co.uk/threads/no-27-detonators.70550/#post-141850

 

[bloome]

Many thanks for this information.