Hollis 221 RegulatorBuilt
with the same quality as the Hollis DC1 regulator, without the swivel turret, the Hollis DC3 is
the ideal 1st stage for double cylinder configuration as well as
perfect for single cylinders. Paired with the Hollis 221 2nd stage which uses the same
technology as the 212 without the dynamic adjustment . This reg set is
designed for those who believe keeping it simple is best.