Hey everyone. I'm replacing my Hayward 11kw cspaxI11 spa heater Thursday. and the original one was hooked up backwards. Going into filter and into the outlet of the heater with the return to pool going through the inlet of the heater. Heater is shot so I ordered the exact same one. As far as plumbing goes my friend who is an electrician said to get some unions, couplers and PVC piping. When I measured it with a tape measure the diameter looks to be just under 3". I know I need PVC cement and prime but no idea about the PVC what to gets. Can I get this all at home depot? Anyone here visually good enough to give me a rough draft of what I would need as far as reversing the plumbing going Into the heater? Any help would be awesome.