OFF GRID Rain Harvesting Part 3 – plumbing & fittings

Attach Fittings to Surround Wall

I didn’t want all the plumbing and fittings hanging off a post on the pavilion. For one there wasn’t enough room and I didn’t think it would look so good.

fittings attached to the tank surround wall filter out debris before getting to the tank

Better in this case to keep it all close to the tank on the taller East wall of the surround.

OFF GRID Rainwater Harvesting flexible rubber couplings

This assembly is attached to the inside of the east wall using some brackets. A 90 degree elbow is attached to the outlet of the first flush diverter T. Then a pipe and fitting assembly is secured to the tank inlet pipe with rubber couplings.
For some of the plumbing here I tried to think about having to disassemble things later. So I only glued what I really needed to.

I’m kinda cheating using Rubber Couplings

OFF GRID Rainwater Harvesting flexible rubber couplings

I like these 3″ flexible rubber couplings with the two screw clamps. They are great for quickly taking sections apart. And to manage tough connection points or those that require some flexibility. I’m not sure how they will hold up to sunlight over time so I may have to add some protection for them later.

rain guard screen on downspout above rain tank insel

Now I’ll add the downspout screen.

overflow of rainwater tank plumbing PVC pipe

Here I’m adding another pipe and elbow section for the tank overflow. It will run into a Y fitting below the gate valve.

First Flush Diverter

OFF GRID Rainwater Harvesting System first flush diverter

A length of schedule 40 pipe is glued into the first flush diverter T then a threaded section glued to the bottom of that. The diverter holds a ball, screen, and pinhole washer and this system is designed to catch the dirty water that is first coming off the roof when it starts to rain. I’ll add a link to a previous video of mine that explains this better.

rain tank overflow pipe to drain

Now I’ll glue up the pipe that runs around the back of the tank to the drain. It has a screened flapper end.

Connect Gutter to Leaf Guard

Connect the pavilion gutter to the rainwater tank

Finally I’ll run a pipe from the gutter of the pavilion to the tank surround. This will dump water onto the downspout screen.

Connect the pavilion gutter to the rainwater tank

This was a bit tricky to pull off. But it ended up working very well. Later I spray painted this pipe and fittings to match the brown gutter.

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