There are no problems here. Screw seals are definitely something of a project. Gonzo Tip: First notch the rubber on the old ones to loosen them from the screws, then lubricate the new ones with silicone. Place the gasket, rubber side down, on the back of the large 1/2" coupler, and then you can insert the screw and tap it in with a soft mallet. Anyway it worked for me.
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