Alphacool 13305 D5-Compatible Spherical Motor Pump - 12V PWM, 1100 L/h, 3.7m Head

High-performance liquid cooling loops demand a pump that can deliver consistent flow and pressure without excessive noise or power draw. The Alphacool 13305 D5-compatible spherical motor pump answers that need with a robust electronically commutated motor, ceramic bearing, and PWM control for precise speed adjustment. It is engineered for custom water cooling systems where reliability and efficiency are paramount.

Who is it for

This pump is ideal for PC enthusiasts, overclockers, and system builders who require a dependable, high-flow pump for CPU and GPU cooling loops. It suits both new builds and upgrades to existing D5-compatible setups, offering a drop-in replacement or performance enhancement.

Main features

• D5-compatible spherical motor design for broad compatibility with pump tops and reservoirs
• Electronically commutated spherical motor ensures quiet, efficient operation
• PWM control allows speed adjustment from 2500 to 4500 RPM to balance performance and noise
• Maximum flow rate of 1100 L/h and head pressure of 3.7 m for demanding loops
• Ceramic bearing and shaft for long service life and low friction
• PPS-GF40 housing resists heat and chemicals, rated up to 60 °C
• SATA power connector for easy integration with standard PSUs

Specifications

• Pump Type: D5-compatible spherical motor pump
• Motor Type: Electronically commutated spherical motor
• Operating Voltage: 12V DC
• Power Connector: SATA Power
• Control Connector: 4-Pin PWM
• Max Power Consumption: 23 W
• Max Head Pressure: 3.7 m at 12V
• Max Flow Rate: 1100 L/h at 12V
• Speed Range: 2500 - 4500 RPM (PWM)
• Housing Material: PPS-GF40 (Polyphenylene Sulfide with 40% glass fiber)
• Bearing Type: Ceramic Bearing
• Shaft Material: Ceramic
• Max Operating Temperature: 60 °C
• MTBF: 50,000 hours
• Inlet/Outlet Thread: G1/4" (requires compatible pump top/reservoir)

Tips

Pair this pump with a quality pump top or reservoir with G1/4" threads to complete the assembly. Use PWM control to fine-tune the flow rate for your loop—lower speeds reduce noise while still providing adequate cooling for most systems. Ensure the loop is properly bled to avoid air bubbles that can affect performance and pump longevity.