No, an adjustable pump is extremely rare, within our application. A (recent) exception is the HydroThruster 500, but it's big bucks.
You can simply add a ball valve in your loop although, a needle valve would give you a finer control, but could be a tad more expensive, and hard to locate. You'll also need a flowmeter, if you're going to go that route: I just picked one up on Ebay for $14.
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