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Usual brown for 7mm holes but the next size up is 8 mm ( blue) so if the brown one isnt tight enough the blue ones fit spot on . Never seen any...
Not tried those , do they sell square drills .
+1 for uno, all I use .
As the” Kopsta” suggests the ropump or a plunger maybe your only wayout . Dont go mad plunging if you blow a pipe off , you are in the ****.
Not sure what you mean wet room type shower , thats a standard shower trap .
Can you get to the other end of the pipe , i.e where it joins soil...
I have never heard you need fire retardant foam , who says that .
I am at a loss why you are impressed with a boiler just by looking at their website
Yep , just didnt know what they called them . Cheers
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