Now just before you go off and use the good advice given by some other posters... Do your FULL calculations before you set your heart on shippings best products.
Bronze fittings for a 1 inch through hull will cost you more than $120. Thats for the thru-hull, valve, bend, and hose barb.
Now how many do you have to do???
Marelon is MUCH more expensive. The valve by itself is nearly $120.
So what does a "few" dollars mean when its your "safety at stake"? Determined by the value of your boat, where you sail it and how long you intend to keep it, and of course how many you are replacing.
Next week I haul and replace 14 of them, thats the lot! And its very expensive. But my boat takes me accross oceans for long periods, and longer periods away from dock
So check to see if you actually need a new valve because of corrosion
or if its just the handle wont turn. If you have no corrosion the replace what you need to, but if yours are corroded in the middle you may need to replace the whole unit, or all the units on your boat if electrolysis
has gotten in.