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Designed for Pro Modders, the Free Center Wrench design used to tighten the barb and the compression ring is perfect for tight spaces because it puts the wrench above the fitting plane giving you more room to maneuver than a conventional wrench. The small wrench notches on the compression ring are also a lot less noticeable than big ugly wrench flats or knurling on the side of a fitting which is normally the most visible portion when installed. Best of all eliminating the knurling gives your fingers a much needed break. Precision machined entirely from marine grade brass with antimicrobial silver barbs/bases so you can run pure distilled or deionized water without the need to add antimicrobial additives that can lower cooling performance. The barb/base also features an internal hex for easy and secure installation and removal. The O-Rings are premium silicone for years of dependable worry free service and are slightly oversized for easy leak free installation in a wide range of products with industry standard G 1/4 threads. World Class Tools. World Class Results. Sold as a 6-pack and includes a Free Center wrench. Model: FCC-3858-6-MB.