Raypak ProTek Shield Assembly, 399K BTU | 017960F The Raypak 017960F ProTek Shield Assembly is a genuine OEM module designed to protect the copper heat exchanger in Raypak digital gas pool and spa heaters with up to 399,000 BTU capacity. This patent-pending technology absorbs corrosion and extends heater lifespan, making annual replacement recommended for optimal protection. Key Features: Compatible with Raypak and Ruud digital gas pool and spa heaters rated up to 399 K BTU Shield takes the brunt of corrosive wear—visible erosion means it's doing its job Suitable for use in both chlorinated and saltwater pool systems Compact, easy-to-replace design with no special tools required Long-term cost savings by preserving the critical heat exchanger Technical Specifications: Part Number: 017960F BTU Compatibility: Up to 399,000 BTU Material: Corrosion-resistant sacrificial shield element Recommended Replacement Interval: Annually or as part of routine maintenance Installation: Direct swap into ProTek-equipped Raypak digital heaters Installing the ProTek Shield annually protects your heater's exchanger from corrosion damage, preventing performance loss and expensive replacements down the line. Its straightforward replacement makes it ideal for service technicians and pool owners alike. Maintenance Tip: Inspect the shield during heater service. Visible erosion or thinning indicates effective action—replace annually to maintain protection. SKU: 017960F