Ok, so anyone who has conquered this exercise in fluid dynamics please let me know. Gravity feeder - EASY Gravity Waterer - not so simple My thoughts: Starting on top & working way down 5gallon bucket for water Verticle 2" pvc pipe out bottom of bucket to a ball valve into a 2" pvc pipe Adaptor to 4" or larger pipe. Approximately 2' of larger pipe then reduce back to 2" (verticle) Ball valve, 2" pipe into a trap Horizontal section of pipe with cutouts for drinking. Process: 1.) Put H2O into bucket 2.) close bottom valve 3.) open top valve filling large section of pipe. 4.) close top valve, open bottom valve (filling drinking section with "on demand" water) 5.) repeat when needed? WILL THIS WORK?