Plumbing Help! with gaskets

Michelle G · Nov 15, 2019

Hello, I bought a used Cadlights 50 tank and the gaskets for the bulkheads are questionable and I have been having a hard time trying to find the right sizes. I have tried BRS and a few other places without any luck. I was wondering if I can get these maybe at home Depot? or online or maybe a DIY recommendation.
I need a 1 1/2" gasket and a 3/4" gasket.
Any ideas are welcome!
Thanks

lapin · Nov 15, 2019

Are you sure none of these will fit?

Replacement Gasket for ABS Bulkhead

Use these gaskets to replace the existing gasket in your ABS bulkhead. Available for bulkhead sizes 1/2", 3/4", 1", 1 1/2" and 2" (Sizes are nominal sizes that refer to the bulkhead size, not the measurement of the gasket).

www.bulkreefsupply.com

If not what size / kind of bulkheads are they?
I see a uPvc 3/4 " bulkhead for sale on the Cadlight site
Also if you know the ID and OD

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

Michelle G · Nov 15, 2019

lapin said:
Are you sure none of these will fit?

Replacement Gasket for ABS Bulkhead

Use these gaskets to replace the existing gasket in your ABS bulkhead. Available for bulkhead sizes 1/2", 3/4", 1", 1 1/2" and 2" (Sizes are nominal sizes that refer to the bulkhead size, not the measurement of the gasket).

www.bulkreefsupply.com

If not what size / kind of bulkheads are they?
I see a uPvc 3/4 " bulkhead for sale on the Cadlight site
Also if you know the ID and OD

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

Hi, The ID is 1 /12" for one and the other is 3/4" based on this I ordered accordingly from BRS and in the attached picture is what I got. Am I reading the dimensions incorrectly?
Thanks!

TDEcoral · Nov 15, 2019

Michelle G said:
Hi, The ID is 1 /12" for one and the other is 3/4" based on this I ordered accordingly from BRS and in the attached picture is what I got. Am I reading the dimensions incorrectly?
Thanks!

Does the 1.25" gasket fit on the bulkhead that has the 1.5" gasket?

Michelle G · Nov 15, 2019

For comparison I took a picture of the original gaskets and the ones I ordered. BRS tech support replied saying these are the correct ones for 1 1/2 " and 3/4" bulkheads.
Clearly I must be missing something.
any ideas? this is my first plumbing project.
Thanks

JoshH · Nov 15, 2019

After looking closer at your pics your gaskets look like they are for 1" and 1/2" schedule 40 bulkheads

TDEcoral · Nov 15, 2019

Which one did you buy?

Replacement Gasket for Schedule 80 Bulkhead

Use these gaskets to replace the existing gasket in your Schedule 80 bulkhead. Available for bulkhead sizes 1/2", 3/4", 1", 1 1/2" and 2" (Sizes are nominal sizes that refer to the bulkhead size, not the measurement of the gasket).

www.bulkreefsupply.com

Replacement Gasket for ABS Bulkhead

Use these gaskets to replace the existing gasket in your ABS bulkhead. Available for bulkhead sizes 1/2", 3/4", 1", 1 1/2" and 2" (Sizes are nominal sizes that refer to the bulkhead size, not the measurement of the gasket).

www.bulkreefsupply.com

Michelle G · Nov 15, 2019

So the ones I need are schedule 80? is that the discrepancy in size?

TDEcoral said:
Does the 1.25" gasket fit on the bulkhead that has the 1.5" gasket?

ca1ore · Nov 15, 2019

Bulkheads are not sized by the ID of the gasket but by the nominal pipe size they will accept. A Sch40 1 1/2” bulkhead, for example, takes 1 1/2” pipe but needs a 2 1/2” hole/gasket. The gasket for a Sch40 3/4” bulkhead has an ID of 1.33 inches, so perhaps that’ll work for your larger bulkhead. A gasket that has a 3/4” ID may be hard to find. Might have to make one.

JoshH · Nov 15, 2019

Michelle G said:
So the ones I need are schedule 80? is that the discrepancy in size?

It looks to me like you need a 1" and 1/2" schedule 40 bulkhead gaskets. If the measurement of the original gaskets from inside to inside are 1 1/2" and 3/4" the actual sizing of the bulkheads will be smaller than that.

Michelle G · Nov 15, 2019

JoshH said:
It looks to me like you need a 1" and 1/2" schedule 40 bulkhead gasket. If the measurement of the original gaskets from inside to inside are 1 1/2" and 3/4" the actual sizing of the bulkheads will be smaller than that.

Great, thank you for that answer. I am so confused I thought replacing the gaskets will be straight forward.

Michelle G · Nov 15, 2019

ca1ore said:
Bulkheads are not sized by the ID of the gasket but by the nominal pipe size they will accept. A Sch40 1 1/2” bulkhead, for example, takes 1 1/2” pipe but needs a 2 1/2” hole/gasket. The gasket for a Sch40 3/4” bulkhead has an ID of 1.33 inches, so perhaps that’ll work for your larger bulkhead. A gasket that has a 3/4” ID may be hard to find. Might have to make one.

Thank you for taking the time to explain the difference!
I think I understand now.
Kind of.. lol

lapin · Nov 15, 2019

The issue is the non std bulkheads they used has messed up more than just you when it came to plumbing that tank.
@ca1ore has it right
1-1/2 ID would be for a 3/4 inch bulkhead. A 3/4 bulkhead needs a 1-1/2 inch hole . It will be close. See chart

Schedule 40 PVC Pipe Bulkhead Fittings

All Bulkhead Fittings are made of Black ABS Plastic, Manufactured Right Here in the USA. Bulkhead Fittings permit safe, quick pipe connections to plastic-metal or plastic lined tanks. Designed to prevent any possible leakage due to poor thread engagement

www.flexiblepvc.net

The 3/4 ID is not common for plumbing pipe. Try the hardware store for starters