CNG Filling Adapter (3000psi) – as of 2020
                                                  (Almost all parts came from WW Grainger)



       1ea - 6PAA1, Ball Valve, 1/4” FPT                            (Grainger’s)  $91.50
1ea – 33HT05,  0-500 psi Gauge (Dry)                     (Grainger’s)  $100.00
1ea – 39A310,  9/16-18 OB x 1/4” MPT adapter  (Grainger’s)  $4.48
1ea – 1DFZ8, 1/4”x1/4” Steel Nipple                      (Grainger’s)  $10.60
1ea – 4VPV7, 1/4” NPT (FxMxF) Steel Tee            (Grainger’s)  $5.55
1ea – CGA-350 #83 Brass Stem 1/4” MPT              (any welding supply company) $6.22
1ea – CGA-350 #82 Brass LH Nut                             (any welding supply company) $2.79
1ea - OPW LB30, NGV-1 adapter                             (OPW Fueling Division)  $115.00
                                                                       
                                                                                                        $336.14 + tax and freight 


Notes:
LB30 is a 3000psi CNG (Natural Gas Vehicle) fueling adapter with Female 9/16-18 ORB threads. The 39A310 adapter gets it back to 1/4” MPT. (ORB means ‘O’ ring Boss, seals with a ‘O’ ring).
OPW will sell direct but you will need to get a hold of an OPW global rep in your area. I got mine from a local OPW Fueling distributor.

Use a dry gauge only. Wet (glycerin) gauges can leak which would contaminate the cylinder.

CGA350 means Compress Gas Adapter 350 series

CNG tanks need to be hydrostatically tested ever 5 years.