Air Conditioning AC Diagnostic A/C Manifold Gauge Tool Set Refrigeration R-134A. You may also like. Air Conditioning AC Diagnostic A/C Manifold Gauge Tool Set Refrigeration Set R134a. For use with R-134A refrigerant Low pressure: 0120psi -18.5kg/cm. High pressure: 0500psi 035kg/cm. Knurled fitting and twist valves Specifications: Blue(Low) Guage: 0-120psi Blue Hose: 1/4 in. FFL x 50 in. Read (high) Guage: 0-500psi Red Hose: 1/4 In. Yellow Hose: 1/2 in. ACME x 50 in. Guage Accuracy: +/- 2%. 1 x Manifold Gauge Tool Set. Order may be cancelled due to insufficient of your information. Missing item or get wrong item or damaged items, or the item seams can not work well, please keep all the items in original condition, make all the items together with packing, then take some photos of them and send us the photos by message box. (2) How we will react? (sometimes you may be requested to return the incorrect item). (3) Valid time for returning. We promise to achieve your 100% satisfaction. Thank you so much for your kindness and understanding.