Tender For supply of oscillating positive expiratory pressure (opep ). specification: (1) product type: oscillating positive expiratory pressure (opep) device (2) weight and portability: it should be hand-held and portable device (3) resistance settings: it should have 5 adjustable resistance settings that can be changed with a lever (4) nebulizer compatibility: it can be used simultaneously with a nebulizer for aerosolized drug delivery. (5) cleaning: it can be easily dismantled and re-assembled for cleaning. cleaning process should be very easy like soap and water which can be done at home by every one