The invention provides an insect trap including a housing having located therein a gas bottle or container, one or more modulators having a viscous medium to produce a pulsed flow of gas and a capillary tube interconnecting the gas bottle or container and a respective modulator; a conduit assembly interconnecting a modulator at one end and connectable to a gas bottle or container at another end; an attachment body for attachment to a gas bottle or container; and a method of producing a pulsed flow of gas from a container or source of said gas.