how to build a bypass valve high pressure low flow water pump or oil pump

This video contains Paid links that gives me a 6% commission if you click and buy any product on that website . This video contains Paid links that gives me a 6% commission if you click and buy any product on that website . Need a high pressure low flow pump for under $1000 ? How about under $200 ??? I can show you how to build one for as low as $100
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