Marshall Excelsior MEC MEGR-9954 LP high-pressure 2-stage gas regulator is approved for use on campers and RV's. Straight through 1/4" female threaded input x male excess flow POL output. Excess flow means that the POL adapter will allow gas to flow only one direction (from the tank).
On stage one the regulator reduces pressure from the propane tank to 10-15 PSIG, and then reducing it even further to 11 inches of water column during the second stage. Most LP appliances require 11 inches of water column to function correctly.
The screened vent on the regulator needs to be positioned so it's face down or under cover to avoid being contaminated with moisture. This unit is pictured with the vent face down. See also model numbers MEGR-9959P & MEGR-9950P for more options.
If your tank hose has a 1/4" flared male end and not a regular 1/4" threaded end, then either order a new hose (MER426-15P or MER426-20P) or adapter # 171043.
If you want the best and safest gas connections, Marshall Excelsior is the brand you want. Lifetime warranty!! Warranty exchanges are instantly done by us. No dealing with the manufacturer.