All port retainer rings from Broadley-James Corporation are 316L stainless steel. Housings and DO sensors come with an attached retainer ring, however, the ring may need to be replaced due to loss or damage.

Since 1999, Broadley-James Corporation has been supplying housings and DO, sensors with a slightly taller retainer ring than in the past. The taller ring and additional threads were necessary to be compatible with the new safety ports offered by B. Braun Biotech and others. These taller rings will fit any old or new port.