High Purity - Brass Barstock Regulator

Model HP721

Model HP721 ultra high-purity single-stage regulator for gas purity levels up to grade 5.0.


Model HP721 is a stainless steel diaphragm single-stage cylinder regulator for pressure control of non-corrosive gases when pressure rise is not critical. Model HP721 is available in both brass barstock and chrome-plated brass barstock (HP721C) with various delivery pressures, CGA/inlet fittings, accessories and other options for a customized regulator to meet specific requirements.


  • 1-11/16"- 316L stainless steel diaphragm eliminates contamination from diffusion or out-gassing
  • One-piece encapsulated seat design with 10 micron sintered internal filter to protect the PTFE Teflon® seat from particulate contamination
  • 2-1/2” dual scale gauges (psi/bar)
  • Ergonomic ABS plastic knob for improved grip
  • Maximum inlet 3000 psig, except for CGA 300 and 510 models that are equipped with a 400 psig inlet gauge.
  • Designed to 1 x 10-9 cc/sec inboard helium leak rate to maintain gas purity levels
  • Equipped with an external relief valve
  • Front or back panel mountable

Typical Applications

  • High-purity gas, research sample system gas and process analyzer gases applications
  • Gas chromatography
  • EPA protocol gases
  • Laser gas systems
  • Emission monitoring systems


Warning -

Cancer and Reproductive Harm -