Chillers, Julabo, FLW4003 Recirculating Cooler -20…+40 °C., water-cooled; 4.3 kW cooling power; ±0.5°C stability. Proportional cooling control adjusts the cooling power to the load of the application saving energy. Units incorporate RS232 interface and alarm output for PC integration and control. Models include a splash-proof membrane keypad with LED temperature display. Level indicator and overflow port on the back. Units constructed of stainless steel and high-grade plastic with stainless steel internal tank. Centrifugal pressure pump. Units with 3 and 6 bar pump include internal by-pass for pressure adjustment with analog pressure gaugeMay be used with water, water/glycol mixtures and silicone fluids.The FL300, FL601, FL1201, FL1701, FLW1701 come with 8 and 12 mm hose barbs. The FLxxx3 models come with 3/4″ hose barbs. The FLxxx6 models come with 1″ hose barbs. Included with each unit: 2 barbed fittings for tubing 1” ID. (pump connections with G 3/4" male)