SmartPool S240U Universal Sun Heater, 4 by 20-Feet Keep your pool warm with a polypropylene heat collector, solar heater features two threaded-elbow adapters Pool accessory has four end caps, four stainless steel hose clamps, one roll of Teflon tape, one rubber connector hose, includes bonus Solar Pill Trilingual installation/operation manual (English/French/Spanish) Direct Flow System - One Header Hole for Each Heating Tube