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FD90 Series Pressure Sensing Coupling, Danfoss / Eaton Hansen and Gromelle FD90 Series Quick Disconnect Couplings Plug, 1/4-18

A 1.90	Air Inclusion Max 0.02 Cubic_centimeter	Application Diagnostic pressure testing for hydraulic systems	Coupling Size -04	Brand Danfoss Power Solutions (II LLC Aeroquip)	Brand Aeroquip	Pack Size 1.00	UOM EA	End Gender 1 13554	End Gender 2 13555	End Size 2 0.25	End Type 1 Push to Connect	End Type 2 NPTF	Fluid Loss 0.10 Cubic_centimeter	Minimum Working Temperature -40	Safety locking Mechanism Sleeve lock	Seal Material Buna-N	Supplier Part Number FD90-1034-04-04	Thread 1 1/4-18	Thread Sealant No	Alternate Part Numbers Alternate Part Number C1CU39, Alternate Part Number MI-00298663, Alternate Part Number MINO-00402F47092	Product Weight 0.01 lbs

Product Questions & Answers 4

Product Questions & Answers

got a pressure test port setup, is this the kind of quick disconnect plug you’d use for diagnostic pressure checks

Question by: Rhonda T on Jul 22, 2025, 8:10 AM

For diagnostic pressure testing on hydraulic systems, the FD90 series plug is made for that job. It is a 2 way, pressure sensing style quick disconnect with flush face valving to keep fluid loss low and air inclusion down during hook up and disconnect.

Answer by: Customer Support on Jul 23, 2025, 4:51 PM

push-to-connect means i dont need tools to hook this up, right? just push it in and the sleeve locks it?

Question by: Ricky M on Feb 7, 2026, 9:09 AM

Correct on both counts. The automatic sleeve handles the locking action as you push the plug in, so no tools or extra steps are involved. One hand is all it takes to make the connection. The sleeve lock keeps it secure once seated, and the same sleeve action releases it when you're ready to disconnect.

Answer by: Customer Support on Feb 8, 2026, 9:15 PM

So, this thing is for checking the pressure on my hydraulics, right? Just wanna make sure I'm understanding that part.

Question by: Earl S on Sep 16, 2025, 4:32 PM

Yes, its primary application is diagnostic pressure testing for hydraulic systems. It gives you a quick and easy way to check the pressure without a lot of fuss.

Answer by: Customer Support on Sep 18, 2025, 6:28 AM

Can this coupling handle being connected and disconnected while the system still has pressure on it?

Question by: Gene B on Jun 10, 2025, 6:15 AM

Up to 500 psi, yes. The self-sealing valve design on the FD90 Series is built specifically to allow connection and disconnection under pressure, so you don't have to bleed the system down every time you need to hook up a diagnostic test point. That's a real time saver when you're doing routine pressure checks on active equipment.

Answer by: Customer Support on Jun 11, 2025, 2:12 PM

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Model Number	Coupling Size	Thread 1	Seal Material	A	Price	Buy Now
FD90-1034-04-04	-04	1/4-18	Buna-N	1.9