Sioux Chief 695-01 - 1/2" PrimePerfect Trap Primer Valve1 2" PrimePerfect Trap Primer Valve Automatically activates to replenish evaporated water in floor drain traps to prevent the escape of sewer gases Large port openings in debris screen prevent clogging from sediment and debris Activates with a 10 PSIG pressure drop at operating pressure of 30150 PSIG Water release is factory set 0. 25 oz per activation, so no field adjustment is necessary Single trap primer can service up to eight traps using splitter