Tongue and groove boards instead of OSB?

[Snailman]

No, but you said that elbutik didn't sell vp2, that's because they have been discontinued and replaced by multifix, which is their successor

Yes, I think I saw pictures of them, but the plaster covers obscured how the ring looked like, sort of...

 

[Gabbe1]

I recommend Biltema's boxes, 26mm deep and with an adjustable ring. 11kr each if you buy 10. Otherwise, a completely okay box to work with and locking clips for the conduit.

 

[-MH-]

Slang? Here we shall bend pipes!

 

[Snailman]

I recommend Biltema's boxes, 26mm deep and with an adjustable ring. 11kr each if you buy 10. Overall, a really good box to work with and with clamps for the conduit.

Yes, I installed some similar boxes like Biltema's but from Claes Ohlsson, there was a discount if you bought at least ten, installed them in the ceiling for the smoke detectors, saved some money compared to the VP2 boxes.

(Have they stopped offering bulk discounts, or is it just in-store?)

https://www.clasohlson.com/se/Apparatdosa,-dubbelgips/p/36-4973

Biltema and Claes Ohlsson have the same price 14:90, but Biltema offers a discount if you buy ten for 109:-, so quite a significant discount.