... Accessories Copper coil, copper connectors, Stainless bolts & nuts, Silicon rubber seal, Dustproof rubber seal, Plastic pipe holder, Ventilating ... installation.Accessories: Stainless bolts & nuts, water-proof silicon rubber, anti-aging dustproof rubber seal, plastic pipe ... , automatically controls water refill and startup of auxiliary heating devicesAnode Magnesium bar, good at eleminating water scale ...