1. External two relief valve ensures maximum serviceability&safety. 2. Forged A-class brass body&housing cap ensures maximum strength, serviceability & safety. 3. First stage reduce fully cylinder pressure by approximately 90% second stage accurately controls flow &delivery pressure. 4. Sintered metal inlet filter to trap impurities. 5. No soldered joints for easy maintenance. 6. Easy to read dual scale gauges 2”. 7. Double stage engineering ensures pressure & flow stability.