Includes a spare O-ring and a small tube of silicone grease. Despite the small size, the tube contains enough material for several repetitions after each filter change. The only preparation required is to gently clean the o-ring before use. Apply a small amount of lube to your fingers and gently spread over the entire ring. A ring and tube lasted me a year or more. In fact, the lubrication can be exhausted before the ring shows any visible signs of wear.
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