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The threading on this pump is machined so precisely that it clicked into my 450 bottle without any wobble or leaks on the first try. I've used it daily for a month now and the spray pattern stays consistent, which is more than I can say for the last one I owned.

Swapped out the old plastic pump on my lab dispenser for this one, and the fit is absolutely perfect—no wobble at all. The mechanism feels much more solid and reliable with each press.

I was worried the old dispenser was headed for the bin, but this pump head screwed on in seconds and works like new. It fits the LAB Spender No. 450 perfectly, no wobble, no leaks. Honestly cheaper than replacing the whole thing.