NITRA BR Series regulators and BFR Series combination filter / regulators start at $37.00 and are designed for use in industrial systems that require clean, accurate instrument air. The BFR combination series has a 40 micron polyethylene filter (5 micron optional) and a manual drain. CR Series precision regulators start at $64.00 and are designed to maintain a constant output pressure even during wide supply pressure variations. The CR series is available in 1/4", 3/8" and 1/2" port sizes. DR Series precision regulators, used in precision fluid control, air gauging, gas mixing and more, have diecast zinc alloy bodies and are available in two pressure ranges. DR-series regulators start at $81.00. Priced at $56.00, NITRA ER Series precision miniature regulators provide the highest level of regulation accuracy and repeatability in a compact, lightweight housing.