Check the listing for details. Polylok PL-122 Septic Tank Effluent Filter. Condition: New. Listed at 85.00 USD. POLYLOK PL-122 SEPTIC TANK EFFLUENT FILTER The PL-122 is the only design with an automatic shut off ball to prevent solids from leaving the tank when the filter is removed for cleaning. It is ideal for residential waste flows up to 3,000 gallons per day. Offers 122 linear feet of 1/16" filter slots, which significantly extends time between cleaningHas a flow control ball that shuts off the flow of effluent when the filter is removed for cleaningHas its own gas deflector ball which deflects solids awayInstalls easily in new tanks, or retrofits in existing systemsComes complete with its own housing. No gluing of tees or pipe, no extra parts to buyHas a modular design, allowing for increased filtrationAlarm accessibilityAccepts PVC extension handleComes with pipe adapter Fits 4" Schedule 40 or SDR-35 PipeOverall length: 24"