a suitable screen 14 of fine mesh material such as nylon or stainless steel overlies the opening 13 or the bottom opening and is secured in place by conventional means such as adhesive or resilient retainers 15 which together with the marginal edges of the screen 14 are accommodated in grooves 16 that encircle the opening 13 preferably the body 12 is provided with reinforcing bands 17 which underlie the screen 14 if the body is formed of a metallic material the screen may be welded or soldered to the body in a preferred construction the body 12 is provided with arcuate axially spaced ribs 18 and 19 that are spanned by protective rods 20 which overlie the screen 14 the rods are secured at their opposite ends by nuts 21 the upper rib 19 has at least one opening 22 therein for a purpose presently to be explained at the open end of the body 12 is a flange 23 provided with an external thread 24 the body has a mouth 25 from which extends a tapered lip 26 having an inclined radially inner surface 27 which slopes in a direction toward the open end of the container body the cross sectional area of the mouth 25 of the body corresponds to the cross sectional area of the body at any point along its length apparatus for.