The 601 series delivers 0.8 ml of foam per stroke — double the volume of a 0.4 ml pump, which suits hand soap, shower gel and foam sanitizer. The wide 40/410 and 43/410 collars sit on larger dispensers without an adapter, and the foam generator is tuned for higher-viscosity soap bases so the lather stays dense rather than watery. PP body, inner spring outside the liquid path, automatic functional test at AQL 0.6 before packing. This variant is moulded in matte black, a finish chosen for dark bathroom sets and premium hotel lines.