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Jun 19, 2020
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The new cylinder I'm installing has 1 inch BSP male connections to the indirect coil. The 1 inch BSP female to 22mm compression adapter I'm fitting has a 1.5 inch across the flats hexagon. As the tank is foam insulated I can't use my big shifting spanner, I need a box spanner or socket spanner, which I don't have and don't look that easy to obtain on a Sunday.

Is there a special plumbing jargon name for such a tool please?
 
What’s a Bosnian spanner?

OP yes a box spanner or deep socket are good tools for this; sometimes it is necessary to cut away some insulation - this can be replaced afterwards.
 
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Thanks for replies.
I improvised a box spanner from a bit of thickish walled steel tube I had kicking around. Rough as a badgers bum, but it worked.
 

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