Primefit Filter Regulator Lubricator 3 in 1 Combo in the Air Compressor Accessories department at Lowes.com
MEANLIN MEASURE 1/4 Inch Air Compressor Regulator with Gauge, 0-180 PSI Air Gauge Regulator Inline for Air Compressor and Pneumatic Tools (Four-way valve) - Amazon.com
Kobalt 3/8-in Air Regulator in the Air Compressor Accessories department at Lowes.com