Just Desserts (ex Menehune) has a Hynautics helm pump marked H-31S. Looking at the H-31S and reading the very limited information about it makes it seem identical to the more common H-21. However one would think that having different model numbers means there is some real difference between the models. Can anyone tell me the difference between the H-31S and the H-21? Has anyone out there installed an H-21 in their Whitby and can compare it to the original H-31S?
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