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Drainpipe/Rats/Bait

What is the best size drainpipe (diameter and length) for putting bait in for rats?
“Every day is ordinary, until it isn't.” - Bernard Cornwell-Death of Kings
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I found the bait blocks better. My neighbour was using grains which ended up all over the path ready for any bird or hedgehog to eat or cat / dog to walk in.
Bait blocks are suspended on metal rods inside the bait box and the rat gnaws at them inside the box. Very effective and no spilt poison.
I only use the bait blocks not grain.
With a bait box you could disable the locking device if you find them really difficult (it's just bit of a knack to use them). You could then make your own simpler 'lock' - perhaps just some strong wire threaded through or round - or a heavy brick on top - anything which stops the lid being accidentally blown or knocked open.
The diameter of the access holes on my boxes are about 1.25"
I have found that hot chilli powder in their runs deters them - at least it keeps them away from the house.