The pump housing itself has unknown size threads. Nipple adapters are required for connection as the pump housing has a custom size fitting with washer. The nipple adapters fit the pump perfectly, but the nipples have a very thin profile and the "pipe thread" for the connection is so small that I didn't even try to use them. Instead I used braided hoses that fit snugly around them and hose clamps. Works great, quiet, good flow. So 1 ring for the useless thread on the nipple.
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