Mastercool's 30 lb DOT tank with float switch and ½” acme connection features a powder coated cylinder for a high gloss, durable finish. It's pre-charged cylinder provides a clean, dry interior while being reusable and conforming to DOT-4BA400 specifications and ARI guidelines. The ¾” NPT opening accepts 80% fill float switch shut-off device. The collar design provide easy handling for storage and transport of recovered refrigerant gases.