A dispensing apparatus (1) is provided comprising a fluid reservoir (4) and a valve (2). The fluid reservoir comprising a body which defines an internal volume which contains a fluid and the body comprising an open mouth.The valve (2) is sealingly coupled to the body of the fluid reservoir (4) to close the open mouth and the valve comprises a gasket seal (18) which engages the body of the fluid reservoir.The gasket seal (18) comprises an elastomer based on an ethylene-propylene-diene terpolymer, which terpolymer comprises from 45 to 55 wt. % ethylene, from 40 to 50 wt. % propylene, and ENB (ethylidenenorbornene) in an amount of 0.5 to 6 wt. %; and wherein the fluid comprises comprises a halogenated ether.