Class "A" — 1,000 gpm or greater and water mains of 10 inches and greater — green caps and bonnets

Class "B" — Greater than 500 gpm but less than 1,000 gpm and water mains of at least 8 inches but less than 10 inches — orange caps and bonnets

Class "C" — 500 gpm or less and water mains of at least 6 inches but less than 8 inches — red caps and bonnets