Watts Drainage offers its Industry Standard Compression Seal Water Closet Carriers. The carriers feature an innovative compression seal design, which eliminates leak problems commonly associated with traditional threaded o-ring seal carriers. Leaking carriers can also trigger dangerous mold formation problems, which can be extremely costly to rectify. The Watts Industry Standard patent-pending design incorporates a bolted compression seal, using an ASTM C564 compression gasket. The smooth ABS nipple mates positively with the compression gasket across a wide area, creating a positive, leak-proof seal, before and after nipple adjustment. Industry Standard carriers install without sealants, and hold an air or water test, first time. Watts Drainage.