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Air Filter Regulator -- Covna 3/8" NPT Two-Unit Compressed Lubricator Piggyback Combo - Poly Bowl, Manual Drain, Gauge COVNA New Update AC4010 Air Filter Regulators Series piggyback lubricator offers space saving complete solution for most effective air filtration, pressure control and lubrication to keep your air tools working properly. COVNA Air Filter Regulators Series piggyback air filter regulator lubricator is offered with Drain (Manual or Auto) and Bowl (Metal or Polycarbonate) options to better suit your needs. Note : Oil Injection on the Lubricator can be adjusted and completed turned off as necessary.