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Re: Frozen Spartan Brass Seacock & broken handle
I have the same Spartan seacocks on my boat, and I am afraid you are going to have to replace the entire assembly. These seacocks are installed by screwing a mushroom fitting through the hull from the outside into the seacock and then sealing it in place with an appropriate compound. To remove it you will need to unscrew the mushroom which will break the seal. At that point you can get a new seacock from Spartan, or you can buy a more conventional one. You may find the Spartan easier to install because the hole is the right size and you should be able to reuse the mushroom.
At this point the seacock is toast. The barrels are matched to the seacocks, and even if you got it out you would not be able to just replace the barrel. I broke the threads on one of mine on the nut end last summer and Spartan does not sell just the barrels.
I have had these seize on me before, and I was able to get them free by inserting a plug from outside the hull, removing the hose and filling up the body of the seacock with penetrating oil and leaving it for an extended time.
I also notice that you were trying to loosen the seacock without undoing the nuts on the side opposite the handle. Sometimes simply undoing the nut can free these, or make them much easier to free.
Just in case you are not familiar, Spartan sells both a lapping compound and seacock grease, and I recommend disassembling all spartan seacocks, lapping them and lubricating them once a year to avoid this sort of problem in the future. robinhoodmarinecenter.com/seacock-grease/seacock-grease/