Replacing overflow bulkheads and standpipes

jawaiianmon · 04/19/2016, 05:49 PM

I have had a 125 (6 foot) aquarium sitting around for a while, so I set it up for my kids. The gaskets on the standpipes looked really old, but I tried them out anyway. Two of them fail the leak test, so I thought I would just buy new plumbing for the overflows.

The two corner overflows each have two 1.25" holes. This would mean I need 1.25" bulkheads right? I see 1" and 1.5" offered in Durso kits, but no sign of 1.25".

Finally, does anyone know of a good place for pre made overflow plumbing? I could make them myself I suppose, but thought it can't hurt to look at the designs.

Thank you very much!

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flooddc · 04/19/2016, 06:13 PM

Look like you need 3/4" bulkheads.
Schedule 40
3/4" 1.050 (OD) 0.804 (ID)
1" 1.315 (OD) 1.029 (ID)
Best way to check is to take a 3/4" pvc pipe and try to see if it fit into the old bulkheads.

thegrun · 04/19/2016, 06:15 PM

Is the actual hole 1-1/4"? That would be somewhat unusual in that that is the hole size for a 1/2" bulkhead, very small even as a return for your tank.

thegrun · 04/19/2016, 06:16 PM

Are you giving the hole size in the bulkhead or the tank?

jawaiianmon · 04/19/2016, 06:27 PM

The actual hole in the bottom of the tank is the exact same size as 1.25" pvc. That's how I measured it.

The old bulkheads accepted 1" pvc inside (which was the bottom part and flowed down to sump) and was threaded 1.25 on the outside (which I used to use to screw on 1.25" pvc for the overflow to the sump).

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jawaiianmon · 04/19/2016, 06:29 PM

I used to use the bulkheads via the outer threads and flex pipe. This time I used the inner part of the bulkhead with 1" pvc to the sump.

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flooddc · 04/20/2016, 06:16 AM

Quote:

Originally Posted by jawaiianmon

The actual hole in the bottom of the tank is the exact same size as 1.25" pvc. That's how I measured it.

The old bulkheads accepted 1" pvc inside (which was the bottom part and flowed down to sump) and was threaded 1.25 on the outside (which I used to use to screw on 1.25" pvc for the overflow to the sump).

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I see! you measure the holes using a "1.25 pvc pipe".
So 1.25" pine diameter is 1.66". This is your holes size.
You need 1" bulkheads then! see BRS supply Bulkhead dimensions

1" ABS Bulkhead Slip X Slip Dimensions (see diagram)
A - 68mm/2.67"
B - 63mm/2.48"
C - 42mm/1.65" (Installation Hole Size)
Use our 45mm Diamond Coated Glass Drill Bit for DIY installation

jawaiianmon · 04/20/2016, 05:18 PM

Thank you

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Sk8r · 04/20/2016, 10:46 PM

When tightening them be a shade cautious: too much force can crack the glass. but you're right---getting new and lively seals will be a good idea.

04/19/2016, 05:49 PM	#1
jawaiianmon Premium Member Join Date: May 2005 Location: Satellite Beach, FL Posts: 200	Replacing overflow bulkheads and standpipes I have had a 125 (6 foot) aquarium sitting around for a while, so I set it up for my kids. The gaskets on the standpipes looked really old, but I tried them out anyway. Two of them fail the leak test, so I thought I would just buy new plumbing for the overflows. The two corner overflows each have two 1.25" holes. This would mean I need 1.25" bulkheads right? I see 1" and 1.5" offered in Durso kits, but no sign of 1.25". Finally, does anyone know of a good place for pre made overflow plumbing? I could make them myself I suppose, but thought it can't hurt to look at the designs. Thank you very much! Sent from my iPad using Tapatalk

04/20/2016, 10:46 PM	#9
Sk8r RC Mod Join Date: Feb 2006 Location: Spokane WA Posts: 34,628 Blog Entries: 55	When tightening them be a shade cautious: too much force can crack the glass. but you're right---getting new and lively seals will be a good idea. __________________ Sk8r Salinity 1.024-6; alkalinity 8.3-9.3 on KH scale; calcium 420; magnesium 1300, temp 78-80, nitrate .2. Ammonia 0. No filters: lps tank. Alk and cal won't rise if mg is low. Current Tank Info: 105g AquaVim wedge, yellow tang, sailfin blenny,royal gramma, ocellaris clown pair, yellow watchman, 100 microceriths, 25 tiny hermits, a 4" conch, 1" nassarius, recovering from 2 year hiatus with daily water change of 10%.

04/19/2016, 06:13 PM	#2
flooddc Registered Member Join Date: May 2012 Location: Maryland Posts: 304	Look like you need 3/4" bulkheads. Schedule 40 3/4" 1.050 (OD) 0.804 (ID) 1" 1.315 (OD) 1.029 (ID) Best way to check is to take a 3/4" pvc pipe and try to see if it fit into the old bulkheads.

04/19/2016, 06:15 PM	#3
thegrun Registered Member Join Date: Dec 2008 Location: Garden Grove, Ca Posts: 17,023	Is the actual hole 1-1/4"? That would be somewhat unusual in that that is the hole size for a 1/2" bulkhead, very small even as a return for your tank.

04/19/2016, 06:16 PM	#4
thegrun Registered Member Join Date: Dec 2008 Location: Garden Grove, Ca Posts: 17,023	Are you giving the hole size in the bulkhead or the tank?

04/19/2016, 06:27 PM	#5
jawaiianmon Premium Member Join Date: May 2005 Location: Satellite Beach, FL Posts: 200	The actual hole in the bottom of the tank is the exact same size as 1.25" pvc. That's how I measured it. The old bulkheads accepted 1" pvc inside (which was the bottom part and flowed down to sump) and was threaded 1.25 on the outside (which I used to use to screw on 1.25" pvc for the overflow to the sump). Sent from my iPad using Tapatalk

04/19/2016, 06:29 PM	#6
jawaiianmon Premium Member Join Date: May 2005 Location: Satellite Beach, FL Posts: 200	I used to use the bulkheads via the outer threads and flex pipe. This time I used the inner part of the bulkhead with 1" pvc to the sump. Sent from my iPad using Tapatalk

04/20/2016, 05:18 PM	#8
jawaiianmon Premium Member Join Date: May 2005 Location: Satellite Beach, FL Posts: 200	Thank you Sent from my iPad using Tapatalk