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FD90 Series Fuel Check Coupling, Danfoss / Eaton Hansen and Gromelle FD90 Series Quick Disconnect Couplings Socket, 1/8-27 NPTF

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Description & Features

This FD90 Series fuel check coupling is ideal for diagnostic pressure testing in hydraulic systems. With a 1/8-27 NPTF thread and -40 minimum working temperature it ensures reliable performance in various applications.

Featuring automatic sleeves for one-hand push-to-connect operation it provides ease of use while maintaining system integrity. The self-sealing valve design allows for connection and disconnection at 500 psi minimizing fluid loss to 0.10 cubic centimeters.

Constructed with Buna-N seals and zinc-plated steel bodies it offers durability and excellent sealing properties. The flush face valving ensures minimal air inclusion optimized for diagnostic requirements. The product comes in a broad range of end configurations to suit diverse system setups.

MPN: FD90-1021-02-04

Supplier Part Number: FD90-1021-02-04

Specifications

A
1.95
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 2
0.13
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
FD90-1021-02-04
Thread 1
1/8-27 NPTF
Thread Sealant
No
Alternate Part Numbers
Alternate Part Number C1CU37, Alternate Part Number MI-00298658, Alternate Part Number MINO-00015F47089
Product Weight
0.23 lbs

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Product Questions & Answers (2)

Question by: Clint W on Jun 5, 2025, 9:06 PM
got a test port setup for checking hydraulic pressure, is this FD90 socket the kind that don’t puke oil everywhere when you unhook it?
Answer by: Customer Support on Jun 7, 2025, 6:57 AM
For diagnostic pressure testing, the FD90 socket uses a flush face, self-sealing valve setup that keeps air inclusion low and limits fluid loss. The spec calls out about 0.10 cubic centimeter of fluid loss, and it is rated to connect and disconnect with up to 500 psi on the line.
Question by: Harold B on Nov 1, 2025, 6:11 PM
fluid loss on these when you disconnect -- how bad is it? got a system where drips and spills are a real headache to clean up
Answer by: Customer Support on Nov 3, 2025, 6:10 PM
Fluid loss on disconnect is about 0.10 cubic centimeters, which is about as minimal as you'll find on a coupling like this. The flush face valve design is specifically what keeps that number low. Air inclusion is even tighter, capped at 0.02 cubic centimeters per connection. For diagnostic pressure testing work where cleanliness matters, that's a solid combination.