This tool should be used as a guide only. SeaQuantum Classic S may not be an exact match for Sea Grand Prix 1000 by but we have given the closest match we can. SeaQuantum Classic S should do the same job and have similar properties but you should always read the technical data sheets for both SeaQuantum Classic S and Sea Grand Prix 1000 to be sure. Please see any notes to see any major differences and call us on 01285 862132 if you have any specific questions.