Compact, lowpower diaphragm water pump engineered for small DC applications. The DC 3V / 3.7V / 4.2V 2.5W 310 electronic starter Diaphragm Water Pump (27mm, A Type) delivers reliable liquid transfer with simple electrical compatibility for battery and lowvoltage systems. Key benefits Lowvoltage operation: runs on DC 3V, 3.7V, or 4.2V sources, making it ideal for 3V batteries, singlecell Liion (3.7V nominal / 4.2V charged) and other portable power supplies. Energy efficient: only 2.5W power consumption keeps battery drain minimal while providing continuous pumping for smallscale tasks. Diaphragm design: positive displacement action handles liquid transfer reliably without complex priming, suitable for intermittent or continuous use in compact systems. Compact form factor: 27mm size and A Type mounting simplify installation in tight spaces and integrated devices. Key attributes Model/type: 310 electronic starter, A Type Pump Power rating: 2.5W Rated voltages: DC 3V, 3.7V, 4.2V Pump type: diaphragm water pump Size: 27mm (compact footprint) Compatibility and use Works with small DC power sources including 3V battery packs and singlecell Liion setups (3.7V nominal, 4.2V fully charged). Designed for applications that require compact, lowpower liquid movement where traditional centrifugal pumps are too large or require higher voltage. Typical applications Portable water dispensers and travel drink systems that need a compact pump running from batteries. DIY electronics, hobby projects, and prototypes that require a small, lowvoltage pump for fluid circulation or transfer. Small garden microirrigation / plantwatering modules and desktop fountains where footprint and power are limited. Installation tips Confirm supply voltage matches one of the rated values (3V, 3.7V, or 4.2V) before use. Secure the 27mm pump in a stable location and route tubing to avoid kinks or sharp bends. For batterypowered setups, monitor run time and recharge or power source as needed to maintain performance. This 310 electronic starter Diaphragm Water Pump (A Type, 27mm) offers a straightforward, lowvoltage solution when compact size and low power draw are essential.