I'll try to answer everyone's questions in one post.
That is schedule 40 PVC, not DWV (drain, waste and vent). Schedule 40 is unnecessary and quite a bit more expensive but it is easier to find fittings for and I own a plumbing business so it isn't an issue for me. Those 6x6x4 tees you see are almost 30 bucks each! Ouch!
The end caps are just rubber test caps with a hose clamp and are about 8 bucks a piece. Very easy to remove and clean the system.
That is a 40 gal rez.
The connectors where the 1/4" tube connect to the manifold are the way to go. The inside diameter of the 1/4" tube is perfect to screw a nozzle in to with no other fittings (screws directly in to the tube)but a 1/4" barbed connector for the manifold end is no good because the hole in the barb is too small. I can't remember the name of the "push-in" style fitting but it is similar to what they call "sharkbite". You just push the tube in and it locks.
The bushings for the spray heads are just rubber corks with a hole drilled through them big enough to accommodate the water lines.
EVERYTHING (fittings, hose, sprayers, etc) here was purchased from Lowes or Home Depot except the pump, reservoir and the chiller.
Sell it for $300? LOL.....it COST me close to 500 (excluding the chiller) to build and GH's Aeroflo are between 1500 and 2k.
The Rez was about 150 with the lid and access door. The spray pump was about 150. There is a second 550gph pump (about 35 bucks) inside the rez feeding the chiller. The chiller was about 350. Theres probably between 150 and 200 in PVC fittings, pipe, strainers, valves, unions, etc.
Thanks to all who commented!
GoHydro!