PolarStar MR Micro Reg Gen 2 Micro Regulator Air Rig w/ 42" Air LineThe ultra compact Micro Regulator stands less than 2. 25" tall resulting in the entire regulator being more compact than a traditional UFA. Thanks to this streamline, low profile design it allows tanks to fit more easily into compact packs popular with minimalist loadouts. This is all done without sacrificing performance as well since the tiny Micro Regulator has a lightning fast recharge rate that is on par with its larger brother the MRS.