MCM XL PUMP...The MCM XL Is Designed For Continuous Operation and Requires Minimal Maintenance. The Low Stuffing Box Pressue and Extra-Heavy Shaft Design Are Engineered to Provide Maximum Seal Life. The Unique Casing Flow Divider On the 10 X 12 X 23 and 12 X 14 X 22 Cut the Radial Load in Half, Which Can Double the Bearing Life.The Heavy-Duty Bearings Are Permanently Lubricated to Minimize Maintenance. Engineered For High Performance. ISO 9001 Registered.