Maybe I'm looking at this the wrong way.
Should the question be: What is the max extension for washing machine feet?
2 x 12mm boards to get floor level with the kitchen floor. Take your pick of easily available 12mm material (Ply/MRMDF etc.)
Had to change the rest of my answer, I thought you were fitting a dishwasher!
Cheers
Just to say thanks for this suggestion as B&Q do small sheets. So I could just get one cut in half. It's a pain when you're looking at the best part of £60 for something you only want a bit of.
@Airhead started
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Maybe I'm looking at this the wrong way.
Should the question be: What is the max extension for washing machine feet?