Skip to the beginning of the images gallery

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

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

Product Questions & Answers 2

Product Questions & Answers

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?

Question by: Clint W on Jun 5, 2025, 9:06 PM

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.

Answer by: Customer Support on Jun 7, 2025, 6:57 AM

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

Question by: Harold B on Nov 1, 2025, 6:11 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.

Answer by: Customer Support on Nov 3, 2025, 6:10 PM