Dwyer MPR1-2 Pressure Regulator, 0-30 Psi, Air Only
Low Pressure Gauge for Propane Regulator 0-30 psi - 2 inches for LDP Regulators - 1/8" - Walmart.com
Airgas - Y12C445D330-AG - Airgas® Model C445D330 Stainless Steel High Purity Two Stage Pressure Regulator With 1/4" FNPT Connection And Threadless Seat