Pool Heater (1).4 units of solar collectors,each is 33cm(1 m²).fixed with 4 pieces of header kits on top and end side.they are pre-fixed(4 m²). (2).2 pcs of end cap (3).2 pcs of reduciton valve (4).8 meters nylon roof strap (5).4 pcs of splicing barbs and 4pcs of small binders (6).4 pcs of pipe clips (7).Available 4m²&5m²,or other specifications.