The MCP35XTM pump is a substantial evolution from the long established MCP355 series. It differentiates itself from its sibling by two primary features. The MCP35X Swiftech pump housing has been redesigned to provide considerably enhanced hydraulic performance is compatible with multiple tubing options thanks to the adoption of the G1/4 port standard can host an optional "built-in" reservoir is also sold separately, and remains compatible with all MCP3XX series pumps. The motor is now PWM compatible, allowing variable speed control thru the motherboard from 1300 to 4500 rpm.