Impco VFF-30 Vacuum LPG Lock Off and Filter New Old Stock. This part is brand new and comes in the original suppliers box. Fits many liquid propane fuel delivery systems, LPG Liquid/Vapor or Low Pressure Natural Gas
Internal fuel filter to keep debris out of the regulator. 
Maximum working pressure is 312 psi.
Flow rate of 26.7 CFM, per min.
Operating vacuum is 2.0 in. of W.C. fully open at 11.5 in. of W.C. 
Filtration is 40 micron.