The new design air suspension solenoid valve (accuair solenoid valve manifolds) is engineered to provide the cleanest installation and most reliable operation on the market. This electronic solenoid valve unit inflates and deflates up to (4) individual air springs and has built-in push-to-connect 3/8” d.O.T. Approved air fittings for all of its plumbing connections. It's more smart than our previous manifolds assembly valve block wiring harness 160-4f solenoid valve. Good replacement to accuair aa-vu4 air suspension valve block