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He's using a top loader.
The front loaders are not anywhere near as bad for our suits. Put it on handwashing or silk.
None of the semi-dry suits I have seen have a drysuit zipper. I own both and zippers are nothing alike.A semidry also typically has a drysuit zipper that can be destroyed in the tumbling action of a front load washing machine, especially if it is a metal toothed zip.
The zip is the most expensive part of the suit to have replaced, often more expensive than a new suit.
OP, I would recommend hand washing in the bath tub.
-Z
Many top loaders have a Central agitator while all front loaders do not.
That is correct, you will be fine without the agitator. Be sure and use the gentle or hand wash cycle.You mean the plastic post in the middle? The ones I see here in Libya don't have it and are simply a front loader turned up.