Sili CS-25Y/H Marine Hand Pump

The Sili CS-25Y/H Marine Hand Pump is a heavy-duty, commercial grade manual positive displacement pump intended to stand up to the rigours of the maritime environment. Featuring a dual-variant configuration Y for oil/bilge and H for seawater/freshwater), this double-acting reciprocating piston pump delivers consistent volumetric efficiency without requiring electrical power or compressed air.

Designed for emergency standby, daily striping or normal fluid transfer aboard vessels. Double-reciprocating action discharges fluid on the forward and backward strokes. This design delivers optimised manual effort and continuous flow over single-acting designs. Constructed with an aluminium alloy case and high-grade stainless steel/bronze internals, it offers outstanding corrosion resistance to extreme marine environments, brackish water and hydrocarbon exposure.

Model Details:

• Manufacturer: Shanghai SILI Pump Manufacture Co., Ltd.
• Series: CS Series (Piston Hand Pump Type)
• Model Designation: CS-25Y/H
• Condition: Brand New

Technical Details:

Marine Applications

• Emergency Bilge Stripping Manual removal of any water remaining in bilge wells when primary electric or pneumatic stripping mechanisms are not available.
• Fuel and lube oil transfers: Small volume replenishment or sampling from storage tanks, settling tanks or oil-water separators.
• Sewage and Greywater Management: Manual removal of non-corrosive wastewater if it does not contain stringy fibres or big particle debris.
• Classification Society Compliant Suitable to satisfy regulatory standby or emergency pumping requirements on tugs, barges, commercial vessels and offshore platforms.

Our Engineer’s Insight:

The SILI CS-25 series is a staple because it strips lines efficiently without losing prime. The internal sealing relies heavily on precision-machined tolerances between the stainless steel piston ring and the cylinder walls. Because this is a positive displacement pump, it will build pressure against a closed line until something breaks. Always ensure your downstream valves are fully open before cracking the handle.