£4.40 Entonox® Clear-guard Midi Breathing Filter £73.50 Pack of 50 Large Adult Size 5 Disposable Anaesthetic Face Mask £73.50 Pack of 50 Small Adult Size 3 Disposable Anaesthetic Face Mask £73.50 Pack of 50 Neonate Size 0 Disposable Anaesthetic Face Mask £1.75 60% Venturi Valve Adult Oxygen Mask