A canister vent valve mounting structure for a canister vent valve is configured to prevent center deviation when the canister vent valve is connected to the canister and enables the canister to be shared by different vehicle models. The assembly 30 further includes two opposing gripping members adapted to grip an edge portion of the sheet of mesh like material 14 and wherein at least one of the frame members 32 includes a channel shaped recess which is adapted to receive the two opposing gripping members, the channel shaped recess having an opening which does not permit the two opposing gripping members to pass therethrough. The arm maintains the sensor pad in close proximity to the casing inner wall.