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FD90 Series Fuel Check Coupling, Danfoss / Eaton Hansen and Gromelle FD90 Series Quick Disconnect Couplings Socket, 1/4-18

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Description & Features

The FD90 Series Fuel Check Coupling, designed for diagnostic pressure testing in hydraulic systems, features an automatic sleeve for efficient, one-hand push-to-connect operation. Its flush face valving ensures minimal fluid loss and low air inclusion, making it a reliable choice in demanding environments.

With a self-sealing valve design, this coupling allows for connection and disconnection at pressures up to 500 psi. The FD90 Series offers a broad range of end configurations, enhancing system accessibility and versatility during testing.

The standard seal material of Buna-N and zinc-plated steel body material provide durability and long-term performance. This coupling is engineered to operate effectively in temperatures as low as -40 degrees Celsius, accommodating challenging operational conditions.

The female push-to-connect and NPTF thread types ensure secure connections, while the sleeve lock mechanism provides additional safety. It is suitable for applications requiring precise and leak-free diagnostics.

ECCN: EAR99

Supplier Part Number: FD90-1021-04-04

Specifications

A
2.25
Air Inclusion Max
0.02 Cubic_centimeter
Application
Diagnostic pressure testing for hydraulic systems
B
1
Coupling Size
-04
Brand
Danfoss Power Solutions (II LLC Aeroquip)
Brand
Aeroquip
Pack Size
1.00
UOM
EA
End Gender 1
13553
End Gender 2
13555
End Size 1
0.25
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
FD90-1021-04-04
Thread 1
1/4-18
Thread Sealant
No
Alternate Part Numbers
Alternate Part Number C1CU38, Alternate Part Number MI-07141007, Alternate Part Number MINO-00015X00422
Product Weight
0.25 lbs

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Product Questions & Answers (6)

Question by: Merle B on Nov 2, 2025, 4:06 PM
got a diagnostic test port setup, is this the socket end that snaps on one-handed or am i lookin at the wrong piece
Answer by: Customer Support on Nov 3, 2025, 4:36 PM
For diagnostic pressure testing work, this socket uses an automatic sleeve so you can push to connect with one hand. It is a flush face, 2 way valved coupler, which helps keep fluid loss low at about 0.10 cubic centimeter and air inclusion low at about 0.02 cubic centimeter.
Question by: Tammy P on Jan 28, 2026, 12:11 PM
sleeve lock on this thing, does that mean it actually stays put once you push it in, or is it the kind that wiggles loose under pressure?
Answer by: Customer Support on Jan 29, 2026, 2:59 PM
Once connected, the sleeve lock holds it secure. You push it in one-handed and the sleeve engages automatically, so it's not going to back out on you. The coupling is also rated to connect and disconnect at up to 500 psi, which means it can handle live-line pressure without needing to bleed the system down first. That's the main reason these get used for diagnostic pressure testing on hydraulic systems.
Question by: Brent B on Nov 27, 2025, 6:42 AM
Will this work for diagnostic pressure testing on my tractor's hydraulic system?
Answer by: Customer Support on Nov 28, 2025, 7:01 AM
Yes, this FD90 series coupling is designed for diagnostic pressure testing in hydraulic systems.
Question by: Kent M on Feb 8, 2026, 7:18 AM
does this thing work at pressures up to 500 psi or do you have to depressurize the line first before connecting it
Answer by: Customer Support on Feb 9, 2026, 10:21 AM
You can connect and disconnect at up to 500 psi without depressurizing the line first. The self-sealing valve design handles that pressure during both connection and disconnection, which saves a fair amount of time when you're running diagnostic checks on a live hydraulic system.
Question by: Kirk C on Jun 7, 2025, 1:03 PM
i need a diagnostic quick disconnect for pressure testing, what’s this FD90 socket actually meant to do?
Answer by: Customer Support on Jun 9, 2025, 8:22 AM
For diagnostic pressure testing on hydraulic systems, it gives you a quick way to connect and disconnect a test point using a one hand push to connect sleeve. The flush face valving helps keep fluid loss low and keeps air inclusion down during hook up.
Question by: Chad M on Sep 11, 2025, 4:57 PM
Can this thing handle fuel? I see "fuel check coupling" in the name.
Answer by: Customer Support on Sep 13, 2025, 11:08 AM
It's designed for diagnostic pressure testing in hydraulic systems, so fuel compatibility should be fine, but always verify fluid compatibility with the manufacturer's documentation to be 100% sure.