Two vents on 2" washer drain

[James Patterson1967]

Is it ok to have two 1 1/2" vents on the same 2" washing machine drain line. The first vent is in the wall where the washer drain turns down and the second one is about 4 feet away which was the original shower drain vent before the shower was removed. The two 1 1/2" vents pipes both rise about 8 feet and then join together before going up and eventually tying into the stack.