there are many products out there, and pretty cheap.
Zeke found that......you can also go to a good hardware store, or propane distributor. they will sell all sorts of fittings and hoses for your purpose.
Propane fitting for home use are just black pipe or brass (not galvanized water pipe, black pipe is made for gas).
remember, it's very low pressure, once past the regulator (approx. .5 psi), so, volume is critical. make sure your main feed line is large enough diameter.
And what Fishy said: be careful. If you're not familiar, ask for help.