The Waterway 550-4270 Crystal Water bulkhead fittings pack includes fitting nuts and an O-ring for compatible 2-1/2 inch to 2 inch applications. A kit like this is useful because it groups key connection and sealing parts together, making it easier to restore the bulkhead fitting area with matching components.Packaged replacement sets are especially practical when both the fastening and sealing elements need attention at the same time. This Waterway pack is a strong choice when the original bulkhead hardware has worn out and the repair calls for a cleaner, more complete rebuild.For compatible Crystal Water repairs, this Waterway bulkhead fittings pack is a practical replacement when the fitting nuts and sealing O-ring for a 2-1/2 inch to 2 inch connection need to be renewed. Waterway Crystal Water bulkhead fittings pack Includes fitting nuts and O-ring For compatible 2-1/2 inch to 2 inch applications Helps restore bulkhead connection and sealing areas Useful for rebuild and repair work