PAC Wide Open G4 Upgrade (P#2122268-4) 2122268-4 Category: GE Healthcare Low Prices Price match guarantee Guaranteed Fitment. Always the correct part In-House Experts. We know our products Easy Returns. Quick & Hassle Free 2122268-4 – PAC Wide Open G4 Upgrade Description Description Physiological Acquisition Controller (PAC) Wide Open G4 Upgrade