I have a question about sizing bulkhead fittings

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MTBjake

Jack Dempsey
MFK Member
Dec 12, 2011
1,513
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Menifee, Ca
I recently bought an acrylic 135gal off of Cragslist and the tank is in decent shape but the people that had it before never hooked up to a sump. It already has holes drilled for drain and return lines but I don't know what size bh fittings to buy. There are 3 holes, and they're roughly 1.75", 1.5" and 1". Also on the wall of the overflow there is another hole that has been filled with some sort of epoxy. This hole is around 1" as well and I assume it's for a return line? Here are a couple pics


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yeah, mine was exaclty the same. one on the bottom and the side of the over flow are for return. the other one on the bottom is to the sump. measure what size the holes are and get the one just a bit smaller, that's the size bulkhead you need. example would be the hole is 1.3" then you'd get a 1" bulkhead. then tho bulkhead is rated at a 1" the hole required will always be just a lil bigger.
 
anarekist said:
yeah, mine was exaclty the same. one on the bottom and the side of the over flow are for return. the other one on the bottom is to the sump. measure what size the holes are and get the one just a bit smaller, that's the size bulkhead you need. example would be the hole is 1.3" then you'd get a 1" bulkhead. then tho bulkhead is rated at a 1" the hole required will always be just a lil bigger.
Click to expand...

Thanks bro So for the 1.75" hole I need a 1.25" bh fitting? Or 1.5? What size did you get for the overflow wall?


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For standard aquarium bulkheads:
A 1" bulkhead requires a 1.75" hole.
A .75" bulkhead requires a 1.5" hole.
A .5" bulkhead requires a 1.125" hole.
 
There are lots of places that sell bulkheads. Here's one of them. The hole diameter needed is given for each bulkhead.

http://www.jehmco.com/html/bulkhead_fittings.html

Notice there are about four different bulkheads: slip/slip, slip/threaded, threaded/slip, and threaded/threaded.

Purchase the bulkheads that best meet your applications.

Slip/threaded bulkhead on the left; slip/slip bulkhead on the right
006.jpg


Sometimes you may need other adaptations, such as a longer uptake or return. There are male and female connectors that can help you accomplish anything that you want.
008.jpg
 
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