The 881VR Series Continuous/Intermittent (Combo) Suction Regulators provides both continuous regulated suction and intermittent regulated suction. This regulator is available in three regulated vacuum ranges: 0-160, 0-200, and 0-300 mmHg. Factory default setting for intermittent regulation is instant off, meaning the timer is set at 8 seconds OFF/ 16 seconds ON, reverse order available (see ordering information). The timer can be easily adjusted from the back of the regulator if necessary. A variety of inlet and outlet fittings are available to cover a wide range of customer needs. Gauges are dual scale (mmHg/kPa) and clockwise, but is also available in ISO styles (counter-clockwise).