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Steel Adapter, 3/4-14 Male NPT To 3/8-18 Female NPT, Straight

A 1.63	Alternate Part Numbers Alternate Part Number C1DX68	Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 5405-12-06	Thread 1 3/4-14	Thread 2 3/8-18	Thread Sealant No	Product Weight 0.30 lbs

Product Questions & Answers 3

Product Questions & Answers

Will this fitting work to connect a 3/4" male pipe to a 3/8" female pipe? Just want to make sure before I order.

Question by: Lee W on Nov 4, 2025, 7:35 AM

Yes, this adapter is specifically designed to connect a 3/4-14 male NPT to a 3/8-18 female NPT.

Answer by: Customer Support on Nov 6, 2025, 6:22 AM

got a 3/4 male NPT port on a manifold and need to step it down to 3/8 female, this the right part for that?

Question by: Kurt F on Sep 23, 2025, 11:43 AM

That's what this adapter is built for. The male end is 3/4-14 NPT and the female end is 3/8-18 NPT, so you're going from the larger male thread into a smaller female port in one straight fitting. No extra unions or couplings needed. Steel construction, straight configuration, made by Brennan Industries under the OM Industrial Products Corp brand.

Answer by: Customer Support on Sep 24, 2025, 4:24 PM

got a fitting with 3/4-14 male npt on it now, will this adapter let me step down to a 3/8-18 female npt port?

Question by: Ricky J on Apr 9, 2025, 9:15 AM

It’s a straight steel pipe-to-pipe adapter with 3/4-14 male NPT on one side and 3/8-18 female NPT on the other, so it’s meant for exactly that thread step-down connection.

Answer by: Customer Support on Apr 10, 2025, 5:07 PM

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Model Number	Thread 1	Thread 2	A
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2040-12-12S	3/4-14	3/4-14	1.93
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2040-4-4S	1/4-18	1/4-18	1.39
2040-4-6S	1/4-18	3/8-18	1.44
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5405-08-16	1/2-14	1-11-1/2	2.18
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5405-12-08	3/4-14	1/2-14	1.94
5405-16-12	1-11-1/2	3/4-14	2.12