Upgraded design with an integrated propane onoff control valve. This feature helps prevent leaks when connecting cylinders and lets you safely start or stop gas flow during refilling. Quick monitoring keeps you informed. A builtin indicator lets you check remaining gas at a glance, so you avoid midfill shortages and unnecessary trips. Easy filling for small cylinders. The 90degree elbow directs gas smoothly into 16 oz tanks. Attach to your main tank and your 16 oz cylinders for a fast refill in about 1 minute. and durable. Made from solid brass, rust resistant and built for long term use. A leakage valve provides reliable performance over time. Practical use scenarios: Camping or outdoor cooking: keep camp stoves and lanterns ready by refilling 16 oz cylinders on site. Backyard grilling or portable heaters: maintain spare cylinders for events or family gatherings. Small workshops and hobbyists: refill propane torches and compact tools with ease.