1 Litre resevoir with screwcap and 4mm tube fitting plus a brass frit(filter)

A spare bottle is useful if you want to change between different types of coolant quickly and without the need for emptying , cleaning and refilling the resevoir. For example you may wish to change from an aqueous to an oil based lubricant.

The 1L resevoir has a 4mm push-in quick connection and can be removed/replaced in seconds.