Propane Fitting Types

Hi,

Before I make my third trip to the big box store, ha, was hoping someone could set me straight on my fitting options.

I would like to plug three of my 5 propane lines, the ones not in use yet as I pulled the fridge, heater, and hot water heater. I am planning for appliances down the road, but would like to test the system now that I have a new regulator.

So the fittings to the heater and hot water heater are flared, and I found plugs for them. To confirm, I do not use tape on the threads, correct?


heaterflare by Tom Myers, on Flickr

And then the fitting on the fridge, I believe is a compression fitting, correct?


fridgeflare by Tom Myers, on Flickr

I take it I need a different plug for this fitting, but have tried two and am lost. I think the first plug was 3/8" and maybe intended for a compression fitting, but was slightly too big, the plugs that fit the flared fittings might fit, but will not slip over the sleeve. Two questions, one, what sort of plug do I need for the compression fitting and how would I measure to get the right size? Or two, should I just convert this fitting to a flared fitting like the others? Not sure if the connection to a propane fridge will need to be of the compression type (vs to a heater or hot water heater which for me are flared)?


Thanks!