I have a little confusion about attaching the pump to the sprayer unit. I have always used tubing in the past. Do you just silicone the pump to the pvc on your original design?
I may just use the tubes so I can move the pump around ( to avoid root overgrowth)
There are many ways to attach the pump to your manifold. I have found these pieces to work best and it is actually possible to assemble the entire manifold from threaded 1/2" PVC. The EcoPlus 396 and 633 pumps both have 1/2" threaded output. The 396 has 1/2" threaded input too, while the 633 uses 3/4" thread (garden hose) - in case you want to run something externally or fit a filter inline.
Refer to the attached pictures:
The blue flex line tubing has 1/2" male pipe thread on both ends. It is available at hardware stores and comes in many lengths. We have 9" through 24" sections at our OSH in town. The pictures show an 18" and 24" section. The great thing about these pieces is that the fittings swivel within the hose - no kinked or twisted hose when replacing a pump or manifold.
The gray sections of 1/2" threaded PVC are available in 1" through 48" sections; in 1" increments through 12" at our OSH. These pieces are great for the AeroCloner and the VegUnit. Combine these threaded sections with various threaded 1/2" PVC elbos and tee's and endcaps - while the pictures do not show this, you can make an entirely threaded assembly.
The nice little threaded elbo is also available at your hardware store.
I've shown the method I use to connect my EcoPlus633 to the tee of the spray manifold. The connection is: Pump, to 1/2" threaded elbo, to 1/2" threaded flex tubing, to 1/2" threaded/slip/slip PVC tee section.
Also shown is how you may use a section of gray 1/2" threaded PVC for the AeroCloner pump connection.
Pump it up!
PS - sorry about the image quality - cell phone pics - didn't feel like pulling out the camera.