Amazon.com: SNS Compressed Air Filter Regulator Lubricator FRL Three Unit Combo 1/4" NPT, Semi-Auto Drain, With Gauge and Bracket, Metal Bowl AC3000-N02 : Industrial & Scientific
3/4" Heavy Duty FRL Filter Regulator Lubricator air control w/auto drain C906NA | eBay
1" Compressor FRL Compressed Air Filter Regulator Oiler Lubricator with Auto Drain - Walmart.com