Keep your pool warm with a polypropylene heat collector, solar heater features two threaded-elbow adapters * Includes, end caps, stainless steel hose clamps, teflon tape, hoses for second collector * Trilingual installation/operation manual (english/French/Spanish) * Ordering Guide for Round Pools, 12 to 18 feet: One box, 21 to 24 feet: Two boxes, 27 to 28 feet: Three boxes * Ordering guide for oval pools, 12 to 24 feet: one box, 15 to 30 or 16 to 25 feet: two boxes, 16 to 32 or 18 to 34 feet: three boxes