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Steel Reusable Air Brake Adapter, 3/8-18 Male NPT To 3/4-20 USF Male USF Swivel, Straight

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Description & Features

The steel reusable air brake adapter is engineered for precision and reliable performance in demanding applications. It connects a 3/8-18 male NPT end to a 3/4-20 USF male USF swivel straight adapter making it a key component in air brake systems.

Manufactured under the trusted brand Danfoss Power Solutions (II LLC Aeroquip) this adapter ensures compatibility and durability for industrial use. The male-to-male configuration is optimized for robust and secure connections. This product does not require a mandrel or thread sealant making installation straightforward.

With both ends featuring male threads the device accommodates a variety of air brake configurations enhancing system versatility. The first end is 0.375 inches and uses NPTF threading while the second end is 0.75 inches with SAE threading.

Catalog number C1AY14 and ECCN EAR99 underline the product's compliance with industry standards. This steel adapter is a vital component for maintaining efficient air brake operations in commercial and industrial settings.

Supplier Part Number: 2038-6-8S

Specifications

Brand
Aeroquip® by Danfoss
Connection Size 1
3/8 in
Connection Size 2
1/2 in
Connection Type
Male USF, MNPT
Connection Type 1
MNPT
Connection Type 2
Male USF
Finish
Dura-Kote™
Fitting Type
Adapter
Material
Steel
Material Construction
Carbon Steel
Series
2038 Series

Similar Products

Model Number Thread 1 Thread 2 Price Action
Steel Reusable Air Brake Adapter, 1/4-18 Male NPT To 3/4-20 USF Male USF Swivel, Straight

2038-4-8S Steel Reusable Male NPT To USF Adapter

1/4-18

3/4-20 USF

Product Questions & Answers (2)

Question by: Vince L on Feb 11, 2026, 7:41 AM
does this adapter need any thread sealant or tape when you put it on, or is it good to go as-is?
Answer by: Customer Support on Feb 12, 2026, 2:04 PM
No sealant or tape required on this one. The NPTF threading on the 3/8 end is designed to seal mechanically without any compound, and the 3/4-20 USF swivel end connects the same way. Just make sure both mating threads are clean and in good shape before you torque it down.
Question by: Rusty W on Aug 21, 2025, 4:57 PM
trying to swap out an old union on an air brake line, is this the one that goes 3/8-18 NPT on one side and 3/4-20 USF swivel on the other?
Answer by: Customer Support on Aug 23, 2025, 6:39 AM
For a straight male to male adapter with those threads, it matches. One end is 3/8-18 male NPTF and the other end is 3/4-20 USF male with a swivel, with end sizes called out as 0.375 inch and 0.75 inch.

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