Hi, I was told I'm going to need a pump shroud but I'm running into problems here. The well is on another property so I can't physically see it right now, but my paper work says the diameter is 4 1/2"(doesn't specify ID or OD so I'm not sure of the true ID). I have a 1.5hp pump that is 3 3/4" (95mm) in diameter. It will be going into a 365ft well, water level is at 305ft where the perforations are. The well is rated at 10 GPM. pump is rated for 8 GPM at 350ft. Ok so the problem I'm running into is I have a green pvc pipe that has a 3 7/8" ID and a 4" OD. That would leave about a 1/16" gap all around, is that enough of a gap? Is my green pvc pipe the 100# 4" thin walled sewer pipe that is recommended to make these shrouds? Do I even need a shroud for a 4 1/2" well? Any help would be great, thanks.