In 2021, one of the Canada customer told us need the diaphragm pump to pumping beer and pureed fruit with 1/2inch and 1inch size. Our stainless steel 304, 316 materials can meet the food grade. Meanwhile they said the people whom work with may not taking care so much for the pump, prefer to the aluminum center block. That is ok, we have PP and aluminum material center block for option, the aluminum center block are more durable and heavy-duty than plastic.