Hi,
A QB80 from ebay is not a bad pump. I use one for 160 litre batches and it turns it over quite well. There is a QB60 for smaller batches also. Not sure how much they go for now, but under $100 was the norm a few years ago.

Chris

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Hers - 96 Mitsubishi Delica Jasper
His - 93 1HDT Landcruiser