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O-Ring for Bump Tube O-Ring Seal Fitting, -08 Size

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Description & Features

The Danfoss / Eaton Spare Part O-Ring is designed for reliable performance in industrial applications.

Manufactured by Danfoss Power Solutions (II LLC Aeroquip), this O-Ring features an internal diameter of 0.426 inches and an external diameter of 0.551 inches. Its -08 size and HNBR material construction, with a 70 durometer hardness, ensure durability and a temperature range from -25 to +300 degrees Fahrenheit.

This O-Ring is specifically intended for use with bump tube O-Ring seal fittings, helping maintain system integrity under various temperature conditions.

Notably, this O-Ring does not require thread sealant.

Segment Code: seg_code_a

MPN: FF90178-13

Supplier Part Number: FF90178-13

Specifications

Dash Size
-08
Brand
Danfoss Power Solutions (II LLC Aeroquip)
Brand
Aeroquip
Pack Size
1.00
UOM
EA
I.D.
0.426 in
Materials
HNBR (70 durometer)
O.D.
0.551 in
Supplier Part Number
FF90178-13
Temperature Range
-25 to +300
Thread Sealant
No
Product Weight
1.06 lbs
Alternate Part Numbers
Alternate Part Number 4033409, Alternate Part Number A/C-OR-8, Alternate Part Number C1EY13, Alternate Part Number G28863D1, Alternate Part Number MI-04069496, Alternate Part Number MINO-00015J59649, Alternate Part Number MINO-00925X13303

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Product Questions & Answers (4)

Question by: Duane H on Jan 8, 2026, 8:14 AM
what kind of heat can these o rings take before they fail. we run some pretty hot lines
Answer by: Customer Support on Jan 10, 2026, 6:26 AM
Temperatures up to 300 degrees Fahrenheit are safely handled by the 70 durometer HNBR material. The working range on these goes from -25 all the way up to that +300 mark.
Question by: Hank B on May 31, 2025, 3:54 PM
got a bump tube o-ring seal fitting that takes an -08, is this the right o-ring size?
Answer by: Customer Support on Jun 2, 2025, 6:00 AM
The key callouts are the dash size and the ring dimensions. This one is a -08 O-ring with a 0.426 inch ID, 0.551 inch OD, and 0.0625 inch width, listed for bump tube O-ring seal fittings.
Question by: Phil W on Sep 12, 2025, 7:12 AM
What size is this O-ring? Just want to make sure it'll fit the fitting I have.
Answer by: Customer Support on Sep 14, 2025, 7:00 AM
It's a -08 size, so it'll fit any standard -08 bump tube O-ring seal fitting.
Question by: Connie O on Oct 14, 2025, 9:04 AM
what temp range does this o-ring hold up to? got a system that sees some pretty cold mornings and hot afternoons
Answer by: Customer Support on Oct 15, 2025, 9:59 AM
Rated from -25 up to 300 degrees Fahrenheit, so swings between cold startups and heat buildup during operation fall well within what this o-ring can handle. The HNBR material holds its shape and seal across that full range without needing any thread sealant applied during installation.

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