A fluid delivery device for discharging a fluid comprising: a housing piston pump biasing mechanism and trigger mechanism. The housing comprises a basal end and a discharge end having an outlet for discharging the fluid. The piston pump comprises a casing defining a pump chamber for storage of the fluid, piston slidably movable relative to the pump chamber, piston plunger, and delivery channel. The trigger mechanism movable from a cocked configuration wherein the trigger mechanism prevents transfer of a biasing force of the biasing mechanism to the casing to thereby prevent movement of the casing towards the outlet of the housing to a triggered configuration wherein the trigger mechanism enables transfer of the biasing force to the casing to thereby cause movement of the casing towards the outlet of the housing so as to discharge fluid from the pump chamber, along the delivery channel and out of the outlet of the housing. The biasing mechanism comprises one or more flexible catch members and a manually operable trigger.
