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Order by 2PM MST
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2045 West Buckeye Road
Phoenix AZ 85009
United States
Chelsea 378970 is a street tee used at the specified transmission-oil cooler-return connection in a Chelsea PTO pressure-lubrication installation. It provides the connection point for the lubrication-hose arrangement; it is a separate fitting, not a complete hose or PTO installation kit.
Choose this tee by the full PTO and transmission configuration, then check the existing cooler-return fitting. Similar-looking tees can have different threads and application requirements. The 378970 fitting has a 1.062-inch–12 UNF-2B female thread; that thread specification does not describe every connection on the assembly.
| Specification | Detail |
|---|---|
| Manufacturer part number | 378970 |
| Fitting type | PTO lubrication street tee |
| Female thread | 1.062-inch–12 UNF-2B |
| Installation location | Specified transmission-oil cooler-return connection |
| Purchase configuration | Fitting only; lubrication hose and other installation components are separate |
| Configuration | Selection guidance |
|---|---|
| Chelsea 272 with remote electric/air shift and EOC | Applicable R-shift (12VDC) and 4-shift (24VDC) installations on Allison 1000, 2000 and 2500 transmissions using this tee. |
| Cooler-return fitting | Confirm the actual return-port fitting and the required mating threads; transmission family alone is not sufficient. |
| Other tee part numbers | Do not substitute a different tee or a suffixed part number without confirming the exact installation requirements. |
Correct lubrication depends on the source connection as well as the fitting. Use the designated cooler-return connection and the hose routing specified for the PTO installation, rather than selecting a convenient transmission pressure port. Have a qualified technician confirm the complete lubrication arrangement before operation.
| Check | Ordering guidance |
|---|---|
| Equipment identification | Confirm the complete PTO model, shift option and transmission model. |
| Mating connections | Check the cooler-return fitting and all hose or adapter connections, not just one nominal thread size. |
| Separate parts | Confirm the required lubrication hose, adapters and installation fittings before placing the order. |
| Installation | Follow the application-specific Chelsea and transmission instructions for connection location, routing and safe installation. |
Need help matching a PTO lubrication tee? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your PTO model, transmission model and photos of the cooler-return connection.
| Weight | 1.1 lb |
|---|