A drug dispenser 1 has a hollow body 2 with a housing 6 for a pressurised
can 7 containing a drug and its propellant arranged on top of the body.
The can has an outlet stem 8 received in a socket 9 in an internal spigot
10. This has a junction with a flexible tube 11, leading to a kink valve
pair 12,14. The tube continues on to a second internal spigot 15, having
a spray nozzle 16 just within a breathing opening 5. The kink valve pair
12, 14 is formed as a moulding of the tube, with side wings 17. Towards
the ends of the wings, they have thinner portions 17.1 at which there are
apertures 18 immediately adjacent the tube. The arrangement defines
positions at which the tube kinks to close its through bore 19. The
thinner portions are provided in two positions, which provide the two
kink valves. An intermediate section 20 of the tube, with a predetermined
volume is provided between the kink valves.