| http://www.w3.org/ns/prov#value | - In most cases there is a sliding device that opens when the lever is activated in order to empty the bowlThat sliding device fits into some kind of seal when it is closed and that seal maust be maintained with an occasional spray of silicone or holding tank valve lubricant.Abrasive cleaners can damage the integrity of that seal, so these should not be used.We have found that a 1/3 Cup of liquid la
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