Valve boxes shall be used as durable, rigid enclosures for valves or other irrigation system components requiring subsurface protection for installation or maintenance. The valve box shall be made of structural foam HDPE resin that is resistant to UV light, weather, moisture and chemical action of soils. Valve box body shall be composed of 100% recycled HDPE. The super jumbo rectangular body shall have knockouts molded into the sides that can be readily removed. The knockouts shall remain an integral part of the body unless removed to run pipes or wires through the valve box. The valve box shall have corrugated sides. The valve box shall have a grooved feature on one side, just below the lid at the top of the box, for inserting a shovel blade or other prying tool to provide easy lid removal. This is useful following compaction of the surrounding soil or after the eventual accumulation of thatch over the valve box. Boxes shall have a stepped feature on the bottom that securely interlocks two boxes together when mated bottom-to-bottom for use in a deep installation. Lids shall have beveled edges to minimize potential damage from lawn equipment. Lids shall be clearly marked with the words irrigation control valve molded onto the top. Lids shall have a marking area measuring at least 6.0 in. by 2.0 in. that is suitable for branding or other means of identification. The locking bolt, washer and clip shall be made of stainless steel. The valve box shall be manufactured by Rain Bird Corporation, Glendora, California.