The grey electrical PVC is fine for aquarium applications. It is not typically rated for any pressure, but can withstand over 100 psi. The long sweep elbows are nice to reduce pressure loss. I would recomend schedule 80 for any unions you put in your system, they are much more durable and will not crack if alignment is off or overtightening. Terasen sells dark grey PVC pipe, it is schedule 80 pipe and prices have just about doubled in the last couple of weeks.
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180g tank(6x2x2) w/170lbs LR, 2-250W 1-400W Halides, 2-3ft t5 Actinics,H&S 1260 200 Skimmer, 1-Tunze 6000stream w/controller, 1-6060stream, 70g sump, 30g refugium Neptune controller, Sequence Hammerhead inline return, Lifeguard 25W UV, 1-Tunze osmolator, 1-Tunze wavebox, 1/4Hp Pacific Coast chiller, MarineTech calcium reactor
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