Please Note: Valve boxes and lids are often brand specific in actual size and shape listed. Size and location of the lid flanges and latch openings, finger holes, or securement properties in the lid and box and may not be compatible just because of the nominal size name. We can not guarantee our Dura valve box components will be compatible with any other manufacturers valve boxes of the same size. Dura Round Replacement Lids are made of high-density polyethylene (HDPE) for long lasting reliability and chemical resistance. Rated for light duty pedestrian traffic only. Green is standard for irrigation use and purple is used for reclaimed water applications. The 10" valve box has a securable lid feature, bolt size required is 3/8"-16, 2 1/2" bolt with a 3/8"washer.Lid SizeOutside Diameter TopFlange DiameterFlange Depth6" Round6-1/4"5-3/4"7/8"7" Round6-3/4"6-1/8"1-3/8"10" Round9-7/8"9-1/8"1-3/4"