Designed for the Eaton Aeroquip 5600 Series Quick Disconnects, the 5600 Series Industrial Interchange Dust Cap protects -04 coupling size ports from contamination when lines are disconnected. With a coupling size of -04 and a 0.25-inch end size, this cap fits the female end of 5600 Series couplings and conforms dimensionally to ISO 7241/1 Series A, making it compatible with standard industrial interchange quick disconnect configurations.
The cap shares the series' PUSH-PULL ball latch design for fast, secure engagement, and features a self-sealing poppet valve that maintains sealing integrity across a wide pressure range. The body is zinc-plated steel with a brass poppet guide, standard for the -04 size. Standard seal materials include Buna-N, EPR, and Viton, supporting compatibility with a broad range of hydraulic fluids. At 0.03 lb, this is a lightweight protective accessory suited for use across industrial fluid line applications.
SKU: 5657-4
Supplier Part Number (MPN): 5657-4
Alternate Part Numbers: C1BT40
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Specifications
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
0.44
End Type 1
Compression
Supplier Part Number
5657-4
Thread Sealant
No
Alternate Part Numbers
Alternate Part NumberC1BT40, Alternate Part Number MINO-00015X07181
what seal materials come standard on these dust caps? trying to figure out if Buna-N is gonna hold up with what we're running through the lines
Answer by: Customer Support on Jun 13, 2025, 8:05 AM
Buna-N is one of three standard seal options available on the 5600 Series. EPR and Viton are the other two. All three come as standard materials, so depending on what fluid you're running, there's likely already a compatible option in the lineup without needing a special order.
Question by: Ray L on Feb 20, 2026, 3:49 PM
got a -04 Hansen FD72/FD76 quick disconnect on a hose, is this the right dust cap for it?
Answer by: Customer Support on Feb 22, 2026, 6:45 AM
For a -04 coupling size in the Danfoss and Eaton Hansen FD72/FD76 family, this part is the matching 5600 Series industrial interchange dust cap.