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If you can't move it with a 2' breaker it's probably never been out. Good chance whoever owned it before was doing the suck up method to winterize. While I personally don't use this method, if done correctly there is absolutely nothing wrong or shoddy doing it this way. My issue with the suck up method has nothing do to with it's effectiveness but more to do with dumping marine AF on the ground. Most will tell you to run 6 - 8 gallons through the system. This means that if you block is taking 3 gallons and say anther 2 for hoses and such you're basically dumping 1 - 3 gallons on the ground.
IMO if you pulled both hoses and ran AF through it you should be good. If it were mine I'd start hitting all the plugs with your favorite penetrating oil, let it sit for the year and see if they won't break free eventually. If they do great, if not you have a work around.
RV and marine AF differ in composition. RV is typically Ethyl alcohol based, is considered non toxic and safe for consumable water systems once the system has been flushed out. Most marine AFs are propylene glycol based which is technically a lubricant that will add corrosion protection as well as freeze protection. While most are labeled non toxic they are typically not recommended for fresh water systems that are used for drinking and should never be consumed. I use the RV stuff in the ballast systems since all the components are plastic/rubber and it's significantly cheaper. I run the marine AF in the block and through the heater core for the added corrosion protection.
IMO if you pulled both hoses and ran AF through it you should be good. If it were mine I'd start hitting all the plugs with your favorite penetrating oil, let it sit for the year and see if they won't break free eventually. If they do great, if not you have a work around.
RV and marine AF differ in composition. RV is typically Ethyl alcohol based, is considered non toxic and safe for consumable water systems once the system has been flushed out. Most marine AFs are propylene glycol based which is technically a lubricant that will add corrosion protection as well as freeze protection. While most are labeled non toxic they are typically not recommended for fresh water systems that are used for drinking and should never be consumed. I use the RV stuff in the ballast systems since all the components are plastic/rubber and it's significantly cheaper. I run the marine AF in the block and through the heater core for the added corrosion protection.
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