The Triax tiple piston pump gives you the most reliable performance in the industry and full tip support. It is built from durable stainless steel and carbide components and bonded with a high strength polymer for the most durable, lightest weight pump. Innovative drop-in on-the-job Triax Pump Replacement with ProConnect lets you replce your modular pump right on the job. Compatible with Ultra Cordless, Ultimate Cordless, and TC Pro Cordless.