1 0 Cummins ISL Engine Brake Price Drop $125 USD Used take off Cummins ISL Jake Head. Part Number: Model 490A Quantity2ConditionUsedFits To Make(s)CUMMINSFits To Model(s)ISLPart NumberMODEL 490AStock NumberRyd MODEL 490A MLS Number11777029CategoryEngine Brakes / Jake Brakes Last Updated1/1/2026 LocationFitchburg, MA, US Sold ByRydemore Heavy Duty Truck Parts (888) 519-___ SHOWNUMBERCall Seller Email Seller Save More Info