Ross, yes I was forgetting that the boil off volume should be fairly similar as the circular surface exposed to the atmosphere would be fairly similar in a 60L pot and a 40L one. I was simply multiplying everything by 2/3 but I take your point.
Those 20 L willow cubes are actually 23 L but I'm not sure about any Rays outdoors or BCF type jerrycans.
I don't know about the current BIRKO taps but mine screws off like so:
and everything can be cleaned out - but eventually the plastic thread that goes onto the metal thread of the tap moulding will strip. On the old Birkos the plastic tap had an inbuilt metal thread sunk into it so it was metal on metal, but it's now made cheaper and nastier. And they want $40 for the plastic tap assembly so they can bite their bums. Ball valve is same or cheaper. If your tap is the same I'd recommend getting a tube of proper tap lube like the sponsors sell and smear the threads with a little bit of that for longer life and no cross threading and forcing.
Those 20 L willow cubes are actually 23 L but I'm not sure about any Rays outdoors or BCF type jerrycans.
I don't know about the current BIRKO taps but mine screws off like so:
and everything can be cleaned out - but eventually the plastic thread that goes onto the metal thread of the tap moulding will strip. On the old Birkos the plastic tap had an inbuilt metal thread sunk into it so it was metal on metal, but it's now made cheaper and nastier. And they want $40 for the plastic tap assembly so they can bite their bums. Ball valve is same or cheaper. If your tap is the same I'd recommend getting a tube of proper tap lube like the sponsors sell and smear the threads with a little bit of that for longer life and no cross threading and forcing.