The stock 3/8 pickup tube fitting on the Milodon pickup is .444 ID at the threaded part that screws into the pump.
The Dipstick tube is .661 ID.
The Milodon with the 3/8 end removed is .645 untill I get a bigger bit. Then it will be .661. In the pictures the readout dropped to .659 from .661. when I was setting the lock screw.
OD is .75
