The budget for this opportunity can be estimated based on the type and quantity of the required items. Assuming an average cost of $500 per RBX Kit/Valve, the total budget can be estimated as follows: 4 EA 2” RBX, Vent-O-Mat, 050RBX2521S4, or approved equivalent: $2,000, 2 EA 4” RBX, Vent-O-Mat, 100RBX1931E4, or approved equivalent: $1,000, 2 EA 6” RBX, Vent-O-Mat, 150RBX1931E4, or approved equivalent: $1,000, 2 EA 8” RBX, Vent-O-Mat, 200RBX1931E4, or approved equivalent: $1,000, 10 EA 2” RBX Kit, Vent-O-Mat, 050RBX074SKu, or approved equivalent: $5,000, 10 EA 4” RBX Kit, Vent-O-Mat, 100RBX074SKu, or approved equivalent: $5,000, 10 EA 6” RBX Kit, Vent-O-Mat, 150RBX074SKu, or approved equivalent: $5,000, 5 EA 8” RBX Kit, Vent-O-Mat, 200RBX074SKu, or approved equivalent: $2,500. The total estimated budget is $22,500. Considering the possible variations in the cost of the items, the budget can be estimated to be in the range of $15,000 to $30,000.