BUILT TO INDUSTRY STANDARDS – Manufactured in ISO 9001 certified facilities and compliant with DOT-4BA-400 specifications and AHRI guidelines; DOT (Department of Transportation) and TC (Transport Canada) Certified for safe and reliable use. HVAC APPLICATIONS – Designed for use to recover, store, and transport refrigerants; equipped with a built-in pressure relief valve for safety HEAVY-DUTY CONSTRUCTION – Durable, refillable tank made from high-grade welded steel and finished with a corrosion-resistant powder coating for long-lasting performance SAFETY TESTED EMPTY TANK – 50LB refrigerant recovery cylinder is X-ray and hydrostatically tested, pre-purged, and vacuum-ready for refrigerant filling (also available in 30LB, 123LB, and 239LB sizes - Models YSNR301, YSNR123, YSNR239) DUAL-ACCESS Y-VALVE – Features a Y-valve for both liquid and vapor access (¼” SAE flare connections); includes an additional 3/4-inch NPT opening compatible with an 80% fill float switch shut-off device (device not included).