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These Trident Reagent Needle guides are a simple and affordable add-on that helps ensure the needle stays straight in the reagent bottles. The guides insert into the neck of the bottle, resting securely under the cap and form a funnel to guide the needle straight to the bottom of the bottle. This helps prevent the needles from flopping around inside of the bottle and catching air due to sitting at an angle. Color-coded & marked guides match the reagent bottles ensuring you don’t mix up the guides and reagents.