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post #1 of 4 (permalink) Old 11-26-2010, 05:45 AM Thread Starter
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Plumbing 101

I am about to plumb my 65 gallon tank and wanted run a few questions by any plumbing gurus out there. I am going to run two seperate canister filters in two seperate closed loop systems through 4 holes in the bottom of my 48"X18"X18" tank. The guy at the reef shop suggested I use 1" bulkheads for the inlet holes and 3/4" bulkheads for the outlet holes. He didn't mention why and I forgot to ask while staring at all the beautiful corals. Anyway, anyone know why and if this is a good idea? When having the holes drilled, should I use what size is recommended from the bulkhead manufacturer recommends or just measure diameters? Again, this would be for two seperate closed loop systems for each canister that will have a Hydor inline heater and GLA inline diffuser on the outlet side of the canister. Does that sound feasable?


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post #2 of 4 (permalink) Old 11-26-2010, 10:07 AM
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I am a plumber by trade and that all sounds reasonable, but i dont know why he would have suggested using two different size bulkheads, from a plumbing standpoint it makes no difference... if anything the inlet should be bigger than the outlet to keep the pump from cavitating but at these flow rates and the type of pump generally used in aquarium filters it wont matter
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post #3 of 4 (permalink) Old 11-26-2010, 07:37 PM
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The advantage of using different sizes is to help prevent you from hooking up the hoses backwards. Other than that I don't see any reason not to use the same size bulkheads. Use the diameter the fitting manufacturer recommends for the holes. It is hard to second guess the manufacturer without knowing exactly why they recommend that size hole.

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post #4 of 4 (permalink) Old 11-26-2010, 08:23 PM
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Only suggestion I would make is to drill all the holes to accomodate the larger 1 inch bulkheads. You can't easily go back if you change your mind on the configurations. You can use reducer bushings if you want to go with 3/4 returns (don't know why it would matter though).

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