Tractor Relief Tool™ Sizes
The Original Tractor Relief Tool™ is available in the most popular sizes for Tractors and Industrial applications.
Know your coupler size before you order
To help figure your size, check out our Coupler Size Search Tool — type the part number stamped on your coupler.
Please determine what size and style coupling you have before ordering here: How To Determine My Size And Style
Skid Steer — ISO 16028 Flat Face
6 sizesEvery flat face size comes with both tools — male and female.
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Best seller1/2" ISO 16028 Flat Face Skid Steer
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Ag / Pioneer — ISO 5675
4 sizes
ISO 7241-A
4 sizes
ISO 7241-B
5 sizes-
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Popular1/2" ISO 7241-B
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Other Styles
3 tools
Don't see your size?
If you do not see your size here, please email us for a special order quote. We can manufacture for other size quick couplers not listed here. We can do custom size pressure relief tools for large business, industrial, R&D, oil and fleet applications. Let us know the size you need! Contact us at Relief@ReliefTool.com
Not sure which coupler standard your tractor or skid steer uses?
Here's how to identify the four most common hydraulic quick-coupler standards — ISO 16028 (flat face), ISO 7241-A, ISO 7241-B, and ISO 5675/Ag Pioneer — before you order.
ISO 16028 (Flat Face)
Sizes 1/4" through 1", common on Bobcat and most skid steers. Distinguished by a flat, flush face with no protruding pins.
ISO 7241-A
Sizes 3/8" through 1", found on various ag and construction equipment. Poppet-style with a distinct nose profile.
ISO 7241-B
Sizes 1/4" through 1", found on various ag and construction equipment, and also common in the oil industry.
ISO 5675 / Ag Pioneer
The traditional ag coupler, sizes 1/4", 3/8", 1/2" and 1", common on John Deere, Kubota, and Pioneer-style ag fittings.
Most commonly confused: The 1" and 1/2" ISO 16028 flat-face couplers look similar but are not interchangeable — this is the #1 reason for returns. Measure the outer diameter of the male coupler tip before ordering, not just the hose size.
How to identify your coupler:
Check the coupler's face shape — flat face (ISO 16028) vs. poppet-style (7241-A/B, Ag Pioneer)
Measure the outer diameter of the male coupler tip
Independently confirm your size — there's no universal standard across manufacturers, so don't assume based on your machine's brand or model alone
Shopping for a specific machine or brand?
See our guides for John Deere, Bobcat, Kubota, or Pioneer.
Hydraulic Coupler Size Chart: ISO 16028, 7241-A, 7241-B, 5675
Tap the chart to open it full screen. Pinch or use + / − to zoom. Open full-size image
Not sure which size you have? Don’t guess.
Email us 2 photos of the male coupler endA side view of the male coupler end, and a tape measure (or calipers) across the male coupler end diameter (not the female end). We’ll tell you the size · relief@relieftool.com
View sizes as a text table
| Style | Body size | Tip diameter | Tool available |
|---|---|---|---|
| ISO 16028 Flat Face | 1/4" | 0.64" / 16 mm | Yes |
| ISO 16028 Flat Face | 3/8" | 0.78" / 20 mm | Yes |
| ISO 16028 Flat Face | 1/2" | 0.95" / 24.5 mm | Yes |
| ISO 16028 Flat Face | 5/8" | 1.06" / 27 mm | Yes |
| ISO 16028 Flat Face | 3/4" | 1.18" / 30 mm | Yes |
| ISO 16028 Flat Face | 1" | 1.42" / 36 mm | Yes |
| ISO 5675 / Ag | 1/4" | 0.56" / 14 mm | Yes (same diameter as 7241-B 1/4", different tool) |
| ISO 5675 / Ag | 3/8" | 0.74" / 18.5 mm | Yes (almost same as 7241-B 3/8", different tool) |
| ISO 5675 / Ag | 1/2" | 0.80" / 20 mm | Yes (same tool as 7241-A 1/2") |
| ISO 5675 / Ag | 3/4" | 1.10" / 28 mm | No |
| ISO 5675 / Ag | 1" | 1.23" / 31 mm | Yes |
| ISO 7241-A | 1/4" | 0.46" / 11.7 mm | No |
| ISO 7241-A | 3/8" | 0.67" / 17 mm | Yes |
| ISO 7241-A | 1/2" | 0.80" / 20.3 mm | Yes (same tool as 5675 1/2") |
| ISO 7241-A | 3/4" | 1.14" / 29 mm | Yes |
| ISO 7241-A | 1" | 1.34" / 34 mm | Yes |
| ISO 7241-B | 1/4" | 0.56" / 14 mm | Yes (same diameter as 5675 1/4", different tool) |
| ISO 7241-B | 3/8" | 0.75" / 19 mm | Yes (almost same as 5675 3/8", different tool) |
| ISO 7241-B | 1/2" | 0.93" / 23.6 mm | Yes |
| ISO 7241-B | 3/4" | 1.24" / 31.5 mm | Yes |
| ISO 7241-B | 1" | 1.48" / 37.6 mm | Yes |
Found your size?
Jump back to your tool:
Still unsure? Email Relief@ReliefTool.com with a photo and male tip diameter measurement or a part number — please don't guess the size you have.
Coupler still won't connect? That's trapped pressure, and the Tractor Relief Tool™ releases it in seconds. See how it works →
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