The Rheem High Altitude Orifice Kit - LP is specifically designed for use in low-pressure gas systems operating at altitudes between 5001 and 8000 feet. This kit includes orifices that are calibrated to ensure optimal gas flow and combustion efficiency at higher elevations. Made from high-quality materials, the orifices are durable and reliable, ensuring safe operation of your gas appliances. This kit is essential for compliance with local regulations and enhances the performance of your heating system in high-altitude environments.