The 651 Series offers a complete range of modular, easy-to-assemble air preparation products. It includes the several filtration options (particulate, coalescing & adsorbing) with an extensive selection of bowl types and drains. Extended temperature range capabilities (-40°F to 176°F / -40°C to 80°C) allow the 651 series to be specified across a broad range of applications and industries. Our regulators and filter-regulators provide customers with the highest in-class flows in the industry. Available port size/thread types include 1/8 and 1/4 (NPTF, ISO 228/1-G and ISO 7/1 Rc).