Male NPT Connector

Grouped product items
NPT Connector for 1/2” Modular Hose

SKU: 202748

In stock

$1.99 $1.99

- +
NPT Connector for 3/4” Modular Hose

SKU: 202807

In stock

$1.99 $1.99

- +

Loc-Line flexible modular hose offers endless plumbing configurations and is useful for unique plumbing designs. Loc- Line Modular plumbing is most commonly used on return lines and closed loops where it is important to direct the water flow in a particular direction.


  • For 1/2" Loc-Line NPT connector use 1/2" threaded bulkheads
  • For 3/4" Loc-Line NPT connector use 3/4" threaded bulkheads
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Product Questions

I’m but the 1” bulk head what size do I need for this so I can get loc line return
Question by: Anthony on Nov 19, 2017, 2:54 PM
You will need a 1" to 3/4" reducing bushing to put into your bulkhead, and then the 3/4" NPT adapter for loc-line. That will then screw into the 3/4" bushing and you can attach more loc-line segments as needed onto the adapter.
Answer by: Charlie on Nov 20, 2017, 2:22 PM
All npt fittings are designed to work with the corresponding pvc size. If you are using a 1" bulkhead, you'll want to get a 1" to 3/4" reducing bushing to be able to use the 3/4" npt loc line adapter.


Have a great day!
Answer by: Zack on Nov 24, 2017, 4:24 PM
I have a 1" bulkhead and dont know how I would transition to the 3/4" NPT and the 3/4" lock line.
Question by: Jason on Jan 8, 2017, 10:41 AM
Great question! If your 1" bulkhead is a slip fitting, you will need the SKU: 208392. This fitting will slip into the bulkhead and convert to 3/4" female thread. From there, all you need is the 3/4" NPT x Loc-Line fitting. These products are listed in the links below. :-)


Answer by: Randy on Jan 10, 2017, 4:31 PM
Which side of the Loc-Line is 3/4? Does it screw into a 3/4 fitting?
Question by: Linton on Mar 30, 2015, 6:40 PM
Great Question Linton!
In order to connect the loc-line to a bulkhead or other plumbing you will need Loc-Line Male NPT Connector, found here: https://www.bulkreefsupply.com/loc-line-male-npt-connector.html. The 3/4" npt connector will fit 3/4" plumbing/bulkheads.
Answer by: Bulk Reef Supply on Mar 30, 2015, 6:40 PM
Are the threads on these the same as on the threaded bulkheads?
Question by: Miles on Jan 13, 2014, 6:00 AM
Hi Miles,
Yes, the bulkheads and all of our plumbing parts with threads are all NPT standard and will fit together.
Answer by: Bulk Reef Supply on Jan 13, 2014, 6:00 AM
Hello, I wanted to know what size bulkhead should i use, i have the 3/4" NPT connector? Also what size diamond bit should i purchase to make the hole for the bulkhead?

Idea for you guys maybe make a bit+bulkhead+NPT connector starter kit.. Just a thought, it would buy it.
Question by: Chris on Jan 11, 2014, 8:46 PM
Hi Chris,
If you want to use the 3/4" NPT loc-line adapter then your best bet would be to use a 3/4" threaded bulkhead. That way you don't need any adapters, etc. Which size drill bit depends on which type of bulkheads. (abs vs sch80) but assuming your typical ABS 3/4" bulkhead your looking at a 35mm drill bit.
Answer by: Bulk Reef Supply on Jan 11, 2014, 8:46 PM
What is the thread size on this product?
Question by: Allen on Sep 23, 2013, 10:10 AM
Hi Allen,
It depends on which fitting you purchase. If your purchase the 1/2" version then it will have 1/2" NPT threads and if you purchase the 3/4" version it will have 3/4" NPT threads.
Answer by: Bulk Reef Supply on Sep 23, 2013, 10:10 AM