Recessed restrictor plate

A restrictor plate assembly for restricting particulate flow into a curb box, through a mouth thereof, the assembly comprising:

• a restrictor plate adapted for being secured at an inside surface of the curb box mouth;
• a proximate clamp structure positioned at a proximate end of the restrictor plate and a distal clamp structure positioned at a distal end of the restrictor plate that is width-wise spaced from the proximate end of the restrictor plate, the proximate and distal clamp structures respectively comprising first proximate and first distal wedge members each adapted for pivotally connecting to a rear surface of the restrictor plate, the first proximate and first distal wedge members extending rearward from the restrictor plate and respectively towards the proximate and distal ends of the restrictor plate;
• and
• a widthwise projecting tab projecting proximately from the proximate end of the restrictor plate,
• wherein the first proximate wedge member is adapted for engaging a proximate internal side wall of the curb box and the first distal wedge member is adapted for engaging a distal internal side wall of the curb box for securing the restrictor plate within the curb box, and
• wherein the widthwise projecting tab is adapted for engaging the proximate internal side wall when securing the restrictor plate therein, whereby the restrictor plate is capable of being substantially centered at the curb box mouth prior to engaging the first proximate wedge member with the proximate internal side wall or the first distal wedge member with the distal internal side wall.