WW2 5 inch long British MkIV vent tube but what for?

[Rrickoshae]

Good afternoon,
Please see the attached photos of what appears to be a large - 5 inches tall, vent tube MkIV.
Does anyone have any ideas what it might be used with?

many thanks, Dave

 

[TimG]

Tube, Vent, Electric, 1-Inch.

B.L., Guns, 6-inch Mark, XXIII and 8-inch. Naval

TimG

 

[glevum]

Discussed here.

http://www.bocn.co.uk/vbforum/threads/46794-Unusual-brass-thing?highlight=hms+belfast+gun

 

[Rrickoshae]

Many thanks to TimG and glevum for the fast Id and response

 

[ron3350]

I have these three 1" Vent Tubes. Note the MF Australian made ones.