urging the annular flange 22 into contact with the first sealing washer 11 such that the outlet orifice 21 lies inside the first sealing washer 11 and is thereby isolated from the metering chamber 6 in this position as shown in fig1 the inlet orifice 18 is located within the metering chamber 6 a flexible tube 24 is engaged within the stepped inlet passage 16 and extends from the valve core 14 to the base of the canister 2 as shown in fig1 thus the inlet orifice 18 is in communication with a region within the canister 2 adjacent to its base 12 the cap 3 is firmly attached to the canister 2 by crimping and thus holds the assembly of the valve body moulding 4 valve core 14 coil spring 23 sealing washers 11 and 13 and sealing ring 10 in place as shown in fig1 with the sealing ring 10 and first sealing washer 11 sufficiently compressed to seal the interior of the device 1 and prevent the egress of its contents downward movement of the valve core in the direction of arrow a against the action of the spring 22 will bring the outlet orifice 21 into the metering chamber immediately after the first orifice 18 has been sealed from the metering chamber 6 by the second sealing washer 13 when filled with a composition in accordance with the present invention as shown at 25 the device 1 will provide metered doses of the composition when used as follows the device 1 should be held in the position shown in fig1 so that the composition 25 by virtue of its pressure enters the metering chamber 6 via.