Bulkhead Confusion

BRS

Forty-Two

Active Member
View Badges
Joined
Apr 15, 2021
Messages
157
Reaction score
85
Review score
+0 /0 /-0
Location
Israel
Hi there

Ive got a tank on order from Miracles, and they have drilled the holes and its about to be assembled.

The holes in the back of the tank are 41mm, which I assumed should be sufficient (and I did ask around but didnt get a lot of answers) for a 40mm bulkhead.

I did manage to find this option:


But Im seeing a lot of bulkheads that are looking for a 43mm hole etc.

Feedback on whether the link should fit or not?
Thanks
 
BRS
OP
Forty-Two

Forty-Two

Active Member
View Badges
Joined
Apr 15, 2021
Messages
157
Reaction score
85
Review score
+0 /0 /-0
Location
Israel
Hmm looks like the link broke - here are the specs

5910E41B-C26B-4B2A-ADDD-269495DAAB93.png
 

Saltyreef

2500 Club Member
View Badges
Joined
Nov 25, 2018
Messages
4,499
Reaction score
4,079
Review score
+0 /0 /-0
Location
Bay Area, Ca
Hi there

Ive got a tank on order from Miracles, and they have drilled the holes and its about to be assembled.

The holes in the back of the tank are 41mm, which I assumed should be sufficient (and I did ask around but didnt get a lot of answers) for a 40mm bulkhead.

I did manage to find this option:


But Im seeing a lot of bulkheads that are looking for a 43mm hole etc.

Feedback on whether the link should fit or not?
Thanks
Heres a quick guide....

Are you talking about the return holes or the drain holes?

If return then those are going to be standard for 3/4" bulkheads.

A standard 3/4" bulkhead from brs will suffice.
iu.jpg
 

KC's CNC Creations

Active Member
View Badges
Joined
Oct 29, 2020
Messages
291
Reaction score
356
Review score
+0 /0 /-0
Location
Southeast Alabama
a standard 1" bulkhead will not fit in a 41mm hole, the minimum is 42.5mm and a 41mm is way too big for a 3/4" bulkhead (sch 80 might work.....).

with that said, the one you linked to says it's suitable for holes 40-43mm so it will work with the 41mm hole and if i read the specs right it's a 1.25" bulkhead.
 

Saltyreef

2500 Club Member
View Badges
Joined
Nov 25, 2018
Messages
4,499
Reaction score
4,079
Review score
+0 /0 /-0
Location
Bay Area, Ca
a standard 1" bulkhead will not fit in a 41mm hole, the minimum is 42.5mm and a 41mm is way too big for a 3/4" bulkhead (sch 80 might work.....).

with that said, the one you linked to says it's suitable for holes 40-43mm so it will work with the 41mm hole and if i read the specs right it's a 1.25" bulkhead.
Actually,
3/4 bulkheads call for 34mm to 52mm.
The photo i posted isnt the most accurate for min and max.

Op, rest assured your 41mm holes will fit a standard sch. 40 3/4 bulkhead.
 
RAP

KC's CNC Creations

Active Member
View Badges
Joined
Oct 29, 2020
Messages
291
Reaction score
356
Review score
+0 /0 /-0
Location
Southeast Alabama
Actually,
3/4 bulkheads call for 34mm to 52mm.
The photo i posted isnt the most accurate for min and max.

Op, rest assured your 41mm holes will fit a standard sch. 40 3/4 bulkhead.
By all means, feel free to use a 41mm hole with YOUR 3/4 bulkhead...........i'll refrain. the entire OD is only 52.6mm............i don't see 0.6mm being sufficient to remain 'water tight'

lol.jpg
 

Saltyreef

2500 Club Member
View Badges
Joined
Nov 25, 2018
Messages
4,499
Reaction score
4,079
Review score
+0 /0 /-0
Location
Bay Area, Ca
By all means, feel free to use a 41mm hole with YOUR 3/4 bulkhead...........i'll refrain. the entire OD of is only 52.6mm............i don't see 0.6mm being sufficient to remain 'water tight'

lol.jpg
A 3/4" bulkhead has a 1.5" OD diameter behind the flange.
Thats only 3mm difference.
Looks like you have a 1/2" bulkhead there....
 

KC's CNC Creations

Active Member
View Badges
Joined
Oct 29, 2020
Messages
291
Reaction score
356
Review score
+0 /0 /-0
Location
Southeast Alabama
Lol now im a cowboy?

Im confused by your suggestion.
You say entire diameter is 52.6mm.
His hole is 41mm.
I dont understand your theory of the .6mm coverage unless he was trying to use it in a 52mm hole....
you said in an above post (i can quote you again if necessary) that a 3/4 bulkhead could use a 52mm hole...........52.6 minus 52 is 0.6. ?
 
Last edited by a moderator:
Avast
OP
Forty-Two

Forty-Two

Active Member
View Badges
Joined
Apr 15, 2021
Messages
157
Reaction score
85
Review score
+0 /0 /-0
Location
Israel
Well at least the topic isnt straightforward, that gives me a little comfort.....

They are indeed return holes. Im on metric - as my sump is on metric and has a 40mm return (outside diameter - not sure what that is on the inside tbh - I think its 33mm), and 3 intakes (40mm/40mm/32mm).

I'll see what Miracles says - whether they think the bulkhead I linked/added the screenshot of will fit.

I would ideally like them to test with a 40mm bulkhead before shipping...because its a LONNGGGG shipment and I would hate to make a mistake this fundamental at this point.

Also its a 220 Gallon tank, the return pump is capable of 6500 l/h
 
Top Shelf Aquatics
OP
Forty-Two

Forty-Two

Active Member
View Badges
Joined
Apr 15, 2021
Messages
157
Reaction score
85
Review score
+0 /0 /-0
Location
Israel
Its ok. Im now having fun trying to figure out a way to reduce it to use loc-line.

Is loc line even necessary? Are there other options that people have used?
 
Zoanthids
BRS

Is your aquarium water as CLEAR as you would like?

  • YES

    Votes: 240 59.6%
  • NO

    Votes: 139 34.5%
  • Don't care that much

    Votes: 18 4.5%
  • Other

    Votes: 6 1.5%
GTA Reef
Top