I have used a CDL vertical releaser with a submersible well pump for 11 seasons. Mine has a hole in the bottom of the outlet line just past the 90 degree elbow. The hole plugged on me in the second season so I enlarged the hole to an 1/8" hole instead of the tiny hole that was factory drilled. It has worked excellent ever since. Just to be sure, I do check and clean the hole every time I clean the releaser.
Joe
2004- 470 taps on gravity and buckets
2006- 590 taps on gravity and buckets 300 gph RO
2009- 845 taps on vacuum no buckets, 600 gph RO
2010- 925 taps on vacuum new 2 stage vacuum pump
2014- 3045 taps on vacuum, new 1200 gph RO
2015- 3104 taps on vacuum
2017- 3213 taps on vacuum
3' x 10' oil fired evaporator with steamaway