For simple culture of anaerobic and microaerophillic organisms, these stainless steel anaerobic jars are robust and easy to use. They have a positively located lid fitted with the unique Whitley Schrader® Valve System and carrier clips for Oxoid Low Temperature Catalyst Sachets. They can be used with either gas generating envelopes or cylinders of anaerobic gas mixture and will vent automatically if excess pressure is applied.