Each pump head system is composed of a heavy-duty pump head, cartridges, and tubing¿each with individually adjustable occlusion settings (order cartridges separately). They feature stainless steel rotors, Rulon rollers, and PSF ends. Occlusion is offset, tangential, and adjustable. For large cartridges, set tubing retainers to your tube size and you are ready to pump. Recommended for use with large cartridge 07519-75 and L/S Precision tubing sizes L/S 14. L/S 16, L/S 25, and certain formulations of L/S 17.