The JOBO 1530 Extension Module is compatible with all 1500 series tanks and extends tank capacity by 3-35mm rolls or up to 4-120 rolls. Minimum solution volume for the extender (not including tank base) is 330mL for rotary agitation and 725mL for inversion agitation. Works great alongside the JOBO 1509 roller base for an economical constant rotational agitation system for ultimate chemical efficiency when using single-shot/non-reusable chemistry.