Rusty propane

[Sailingbluew]

I have a rusty propane tank it has been sitting in water due to stuck draining valve. Any idea how to unclog it?

It must be full of rust.

I got the got 3 days ago and try to open the gas valve and when it didn't work I pulled it out and found this.

How do I dispose or exchange it in Mexico?

[boatpoker]

"Draining valve" !
There should be no valve in the drain of your propane locker.

Get rid of that tank and fix your locker drain.

[SailingHarmonie]

Exchange it???? Really? You would send this tank off to be refilled and given to someone else? REALLY???!?!?!!?!?

If there is still propane in here this is a disaster waiting to happen. It is YOUR problem. You have screwed up by letting this mess occur. Do not just throw it in the trash and turn it into someone else's problem that might kill them. Be responsible for the mess you have made.

A proper modern tank valve will not allow the propane to come out of the valve if there is no hose attached to the outlet.

Is there any propane in the tank? When you shake it can you feel liquid sloshing around? If yes, you NEED to empty it before you throw it in the trash. If you are lucky, the tank rusted until it developed a pin-hole and the propane all leaked out.

[Sailingbluew]

Oh, that is good news. There is this half eaten metal knob in the bottom. I thought any gas leak would go through there and out

[Sailingbluew]

I have had the boat for 3 days and it is impossible to unscrew the top

It is actually a drainage hole:

[Pandor]

Yes. Propane lockers have a drain vent at the bottom. No valves. Pull apart the hose and unclog.