Female Bulkhead Union 1873X4X4

Specifications

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

Product Questions & Answers

Is this the right fitting if I'm tryin to run some air lines on my truck?

Question by: Wade K on Jun 12, 2025, 6:09 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.

Answer by: Customer Support on Jun 14, 2025, 6:29 AM

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

Question by: Tammy G on Dec 20, 2025, 5:46 PM

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.

Answer by: Customer Support on Dec 22, 2025, 8:25 AM