Miller DuraHoist Confined Space Manhole Collar Diameter Size Options:27.5" A standard 20 lb tank

A standard 20 lb tank can provide up to 10 hours of continuous heating

Can stick to a variety of surfaces - not just for hard hats

Detachable in seconds

This regulator is an excellent alternative for bump testing gas monitors

Miller DuraHoist Confined Space Manhole Collar Diameter Size Options:27.5" A standard 20 lb tankThe Miller DuraHoist manhole collar is designed to easily and quickly mount to manhole collars. Simply slip the collar into manhole, tank hatch, or other opening and then mount you DuraHoist mast. That's all it takes and your ready to go. The DuraHoist collar is available in a variety of sizes: 17. 5 in. (. 44m) Manhole Collar for use with 18 in. to 20 in. 19. 5 in. (. 50m) Manhole Collar for use with 20 in. to 22 in. 21. 5 in. (. 54m) Manhole Collar