Image 1 of 2 Image 2 of 2 Additel 9240A Differential Pressure Gauge Holder with Built-in Additional Volume for Low Pressure Control $660.00 Add To Cart Added! Differential pressure gauge holder with built-in additional volume for low pressure control. Differential pressure gauge holder with built-in additional volume for low pressure control. You Might Also Like Additel 9919-2 Carrying Case for Additel 685 Gauges $216.00 Additel 9084 - External reservior connection components for ADT793 controller (Includes 2 pcs 1.5m × 6mm hoses) $239.00 Additel 109-KIT Contamination Prevention System Kit $1,709.00 Additel 123 Hydraulic Pressure Manifold $1,800.00 Additel 9251 - Rubber Boot for 681 gauge $47.00