I have the other MK4, without the Dry-Pac. Can this product be used on the non-Dry-Pac, MK4?
Yes. The base fitting is the same.
Will this work with the Umarex Hill PCP Superfill hand pump?
Can this be used with Air Venturi G7S Hand Pump ?
Do i need this dry pack to get started
No, the Hill pump will work without it
Can this work on Bj pump that came with Discovery?
Can this be used with the AV- A00090 pump
Can/does this work on the AV G7s hand pump? Does the G7s even need it?
No, no way to attach it.
Will this work on the AV booster?
No, there is no where for it to attach.