- This prime valve is made to fit many of Graco’s larger electric units and most of their gas sprayers
***Please check your manual and part number to verify whether you have the larger or smaller prime valve that Graco makes. There are 3 different prime valves depending on your part number. We show all three since there are too many variations with the units. If you are unsure which one you have you can look at the pictures or call or email us for help.
They are as follows: