Mastercool 50 lb D.O.T. Approved Recovery Cylinders feature powder coated high gloss durable finish, y-valve for liquid / vapor, 3/4" NPT opening accepts 80% fill float switch shut-off device, 1/4" opening for air purge valve, easy to handle collar, conforms to DOT-4BA400 and ARI guidelines, pre-charged for a clean dry interior, store and transport recovered refrigerant, valve and float switch are UL listed, AUS and TC Canadian approved.