Hi Jim,
I have a well with 4 inch bore (pipe with 4" ID) and want to switch to a 4" submirsible pump. my question is with a 4" submirsible pump how much clearance do i need.
does the bore not need to be much larger then 4" otherwise how will the pump suck water if the will pipe walls are touching the pump.
Thank you for your interest in Water Pumps Direct. The actual pumps measure 3.90" in diameter and will fit inside a 4" ID well casing.