Marine Metal Bubble Top Combo -It's a universal 5-gallon bucket lid with a built-in aerator that can run up to 40 hours on a single set of 2 "D" batteries. What's more, its hinged top door folds out to double as a cutting board with tabs for fishing accessories. The tank-tested aerator pump works for both fresh and saltwater and has a weighted air stone and airline-grade silicone tubing for maximum airflow. UV-treated. Fits most 5 gallon buckets (bucket not included)New multi-purpose lid has large opening for easy dip net access, cutting surface, and mounting tabs for tools, hooks, and tackleBubble Box pump runs +/- 40 hours with 2 alkaline D cell batteries, also runs on 1 batteryPumps 1.4 STL/minuteImpact water resistant case with rubber booted switchBeryllium copper battery contacts for longer battery lifeWeighted air stone with 24" of silicone air line tubing enclosed in pumpLarge adjustable stainless steel clip for attaching to any bucketDesigned for fresh and saltwater useEach pump individually tank tested to assure highest quality