Ronstan's range of continuous line furling systems puts great performance and reliability within the reach of cruising and racing sailors alike. This compact rotation stop can be added to Series 120 furlers to prevent inadvertent unfurling of the sail. The rotation stop is installed on the underside of the furler and can be locked out when in use, or in when the sail is furled or stowed. It can be manually or remotely using a trigger line.