The Raypak 105A/105B Tube Bundle is a replacement tube bundle or tube assembly for compatible Raypak heaters. This component sits within the heat exchanger area and carries pool or spa water through the heated section of the unit. Part 004903F is typically considered when the original bundle is leaking, internally restricted, damaged from freeze conditions, affected by aggressive water chemistry, or no longer transferring heat effectively.Tube bundle replacement requires careful model confirmation because capacity, header fit, tube layout, gasket surfaces, and surrounding hardware can differ across Raypak heater sizes. During installation, related headers, bolts, gaskets, bypass parts, and water flow conditions should be inspected to help protect the new assembly. Proper balancing of flow and attention to water chemistry can make a major difference in long-term heater performance. Replacement tube bundle or tube assembly for the Raypak heater model listed Helps move pool or spa water through the heater’s heat transfer section Used when leaks, scale buildup, corrosion, freeze damage, or flow restriction affect the original bundle Should be installed with inspection of headers, gaskets, bypass parts, and fastening hardware Verify heater model and part number 004903F before ordering
