£445.00 Entonox® Basic Pain Relief System without Case £177.00 Pin Index Regulator/Multiflow Valve for D Size Cylinders £4.30 Pin Index Flat Key for Oxygen and Entonox® Cylinders £150.00 Bullnose Oxygen Regulator with Multiflow Valve for F Size Cylinders £98.00 Select-a-Flow Meter with BS Probe