precision, flow delivery Flow range 0400 ml/min for quantitative liquid delivery in aquariums, laboratories, analytical instruments, and related applications. Flow direction can be controlled by switching between positive and negative poles, enabling bidirectional operation without additional hardware. Optimized roller design for easy hose replacement Calibration roller design enables simple hose replacement. Reduces pinching or hose damage caused by inexperience and enhances safety during maintenance. Quiet and durable roller system Roller uses ball bearings for quiet operation and long life. Stainless steel screws provide rust and corrosion resistance, supporting reliable longterm use. Quick assembly and disassembly for efficiency Handtightening pump cover allows fast assembly and disassembly, facilitating hose replacement and routine maintenance. Compatible with a variety of motor types to support constant or variable speed operation and meet diverse application needs. Key specifications and compatibility Flow range: 0400 ml/min Flow direction: reversible by polarity (positive/negative poles) Roller system: includes calibrated roller with ball bearings Fast maintenance: handtightening cover for easy access Materials: stainless steel screws for corrosion resistance Practical use scenarios Aquarium dosing: precise, repeatable delivery of nutrients, meds, or water conditioners with easy flow control and quick hose replacement. Laboratory reagent delivery: accurate feeding of reagents to analytical instruments or test benches, with compatibility for both constant and variable speed motor drives. Instrument integration: integration with various motors for programmable flow control in analytical devices or process rigs, enabling reliable and repeatable results.