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. DESIGNED FOR A2L REFRIGERANTS – Designed for use to recover, store, and transport A2L refrigerants, which are mildly flammable and used in a wide variety of refrigeration and air conditioning applications A2L TANK: Equipped with reverse (left-hand) threads and a built-in pressure relief valve, both of which are critical safety features 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 – 123LB refrigerant recovery cylinder is X-ray and hydrostatically tested, pre-purged, and vacuum-ready for refrigerant filling (also available in 30LB, 50LB, and 239LB sizes - Models YSN301R-A2L, YSN501R-A2L, YSNR239-A2L).