Apollo Conbraco Compact Pressure Reducing Valve 3/4 in.. For maximum performance at an economical price, no other electric valve can compare to Lasco's valve. It is the sensible choice regardless of your water source. Even potable water will eventually clog the types of screens found in other “contamination proof” valves. This translates into more maintenance work and more long term cost. On the other hand, Lasco's valve serves dependably under the most adverse conditions. Sludge, algae, silt, and other contaminants have no effect on the valve action.