MB-18 Polyethylene Water Meter Box Lid Options Approximate Measurements 14.69"x 16.44"x1.75 The MB-18 has several lid options depending on the users preference. All MB-17 lids are 14.69"x 16.44"x1.75" and usually interchange with Brooks and CDR boxes as well as our own. All lids for this box have the new snap lock design. The solid lid has one 3/4" round hook hole for lifting the lid out of the box. The neptune lid can perform double duty since it has one depression that can accommodate either the RS900 radio head with the offset center or a round touchpad reader. The hinged reader lid is a polyethylene lid with a center flap that is made of cast iron with a stainless steel rod. The I-tron lid is a solid polyethylene lid with the 3/4" round liftt hole and a pouch underneath for the I-tron ERT reader.