I'm not familiar with Centurion's but the Nautique runs a closed cooling system with a raw water pump. I use a 5 gallon bucket, mix 1 gallon of anti-freeze with 3 gallons water and a 1" barbed connector w/ clear 1" tubing (home depot/lowes) connected to my pick up hose. Start the boat, run the engine until the bucket is empty and you are winterized. Remember to flush it out before hitting the lake. I never worry about the hard tanks, plenty of room for expansion.
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