Female Bulkhead Union

Description & Features

The Eaton Aeroquip Female Bulkhead Union is engineered for high-performance applications, particularly in air brake systems, withstanding temperatures up to +200°F. This versatile adapter is designed for ease of use with a 0.25-inch Push to Connect female end and a 0.5625-inch NPTF male end, making it a reliable choice for complex installations. The brass construction ensures durability, while the Dura-Kote plating provides exceptional corrosion resistance, exceeding SAE standards for operating pressures.

With a hex size of 0.69 inches, this union adapter offers design flexibility across various configurations, thanks to a wide range of available styles. The Weatherhead sub-brand guarantees a product that meets the rigorous demands of industrial environments, ensuring long-lasting performance and reliability. Please note, this product is not suitable for fuel, water, or oil applications.

SKU: 1873X4X4

Supplier Part Number (MPN): 1873X4X4

Specifications

Alternate Part Numbers
Alternate Part Number MINO-00015X03665
Application
Air brake systems except where temperatures exceed +200°F or where battery acid can drip on tubing. Not for fuel, water or oil.
Brand
Danfoss Power Solutions (II LLC Aeroquip)
Brand
Aeroquip
Pack Size
1.00
UOM
EA
End Gender 1
13553
End Gender 2
13556
End Size 1
0.25
End Size 2
0.56
End Type 1
Push to Connect
End Type 2
NPTF
Features
Dura-Kote plating for superior corrosion resistance|Design flexibility with hundreds of styles to choose from|Higher operating pressures above SAE standards
Hex Size 2
0.69
ICC
Union Adapters
Item Type
Push to Connect Female/NPTF Male Union
Language
English
Product Material
Brass
Product Width
0.69
Sub Brand
Weatherhead
Supplier Part Number
1873X4X4
Product Weight
0.08 lbs

Product Questions & Answers (2)

Question by: Wade K on Jun 12, 2025, 6:09 AM
Is this the right fitting if I'm tryin to run some air lines on my truck?
Answer by: Customer Support on Jun 14, 2025, 6:29 AM
This Eaton Aeroquip fitting is designed for air brake systems, but there's a temperature limit of +200°F. Also, it's not made for fuel, water, or oil lines, so you'll need to confirm compatibility with your specific application.
Question by: Tammy G on Dec 20, 2025, 5:46 PM
this fitting work for air brake lines on a trailer? seen a lot of brass push-connect fittings but want to make sure it handles the pressures right
Answer by: Customer Support on Dec 22, 2025, 8:25 AM
Brass construction and a push-to-connect design make this a solid pick for air brake system work. Eaton Weatherhead built it to exceed SAE pressure standards, so it holds up well in demanding brake line applications. One thing worth knowing upfront: keep it away from any setup where temps climb above 200°F, and it should never be used on fuel, water, or oil lines. Stick to air brake use and it'll do the job.