The 70R9091S 90-degree step-up fitting is engineered for mobile air conditioning systems that require transitioning from a #10 female O-ring connection to a #12 refrigerant hose while maintaining serviceability. Its steel construction delivers excellent strength and vibration resistance, while the reduced beadlock design allows for reliable crimping with a slimmer overall profile.
An integrated 13mm R134a charge port enables easy charging and diagnostics without additional adapters. This fitting is well suited for heavy-duty truck and industrial HVAC applications where space constraints, durability, and service access are critical. Broad OEM and aftermarket cross references make it a dependable solution for repairs and custom hose assemblies.
Product Specifications
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Part No.: 70R9091S
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Factory No.: RD-5-8956-0P
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Type: 90° Step-Up
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Material: Steel
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Fitting Style: Female O-Ring
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Connection: #10 Female O-Ring × #12 Hose
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Thread: 7⁄8″ – 14
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Fitting Size: #10
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Hose Size: #12
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Hose End: Reduced Beadlock
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Service Port: 13mm (R134a)
OEM Part Numbers
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Air Source / MEI: 4513SR
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Alliance: ABP N83 310540
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Freightliner: RDH RD5 8956 0
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Mack: 4379-RD589560
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Truck Air: 08-6937BS
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Volvo: RDHRD589560P
Aftermarket & Industry Cross References
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TRUCK AIR – MEI: 08-6937BS
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OMEGA: 35-R1327-3STL
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TEXAS TRUCK AC: 550-SR3536-6
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COOLSTAR – MEI: 610-5937
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EUCLID: E-808836R-10-12, E-808838R-10-12
Interchange Numbers
08-6937BS, 232-8260, 35-R1327-3STL, 4379-RD589560, 4379-RD589560P, 4513SR, 550-SR3536-6, 610-5937, 70R9091S, ABP N83 310540, E-808836R-10-12, E-808838R-10-12, FT55937, RDH RD5 8956 0, RDHRD589560P, RDT70R9091S
Important Installation Note
For all refrigerant fittings, be sure to use Red Dot refrigerant hose or equivalent.
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