Mk5 white manual bilge pump - under-deck mounting

To install the Whale BP0535 pump below deck, follow these main steps:

Mark and drill four holes for the mounting bolts.Complete the installation using 6 mm (¼") bolts.Attach a 38 mm (1½") hose to the inlet and outlet fittings, ensuring a watertight seal.The suction hose must be positioned so it does not draw against a flat surface.The discharge hose should terminate at a through-hull fitting well above the waterline, preferably at the transom.It is advisable to include a seacock valve in the line to prevent siphoning.Test the installation for air leaks, proper priming, and discharge flow.

Yes, to optimize pump performance, it is advisable to use a Whale strainer (strumbox) to help draw the last drops of water and prevent the suction hose from sticking to a surface. It is also recommended to include a seacock valve in the discharge line to prevent siphoning risk.

The pumping capacity of the Whale Mk5 BP0535 pump depends on installation conditions and pumping rate. Users should be aware that the capacity may not be sufficient to handle a rapid influx of water.

Yes, the rubber parts of the Whale Mk5 BP0535 pump can be replaced. The process involves removing the top cover, the body and the rocker arm nut to access and replace the diaphragm, inlet valve, outlet valve and gasket.

Use a 38 mm (1½") hose for the inlet and outlet connections of the Whale Mk5 BP0535 pump to ensure a watertight and efficient connection.

The Whale Mk5 manual bilge pump, part number BP0535, is specifically designed for manual water pumping and bilge draining. It is ideal for applications requiring reliable pumping aboard a boat.

This pump is designed specifically for manual pumping and bilge drainage. It is intended to pump water.

The pump's output capacity depends on your specific installation conditions and the pumping speed. Note that its capacity may not be sufficient to handle a very rapid influx of water.

Use 38 mm (1½") hoses for the pump’s inlet and outlet connections. Ensure airtight sealing during installation.

For flush-mount installation, you must mark and drill one large hole and eight small holes. The unit is secured with eight 6 mm flat-head screws. The rubber gasket must be mounted slightly above the pump’s mounting flange. It is critical to attach the 38 mm hose to the inlet and outlet fittings with an airtight seal.

Yes, it is entirely possible to change the flow direction. To do this, you must remove the eight assembly screws from the pump, then reassemble it in the desired configuration. It is important not to remove the valves from the pump body and not to align the outlet port with the pump.

If the pump does not prime or clogs, check the following points:

Air intakes or obstructions in the inlet hose and its connection to the pump.A damaged diaphragm.Dust buildup under the valves or bent valves.Collapse of the inlet hose during the suction stroke.

A range of spare parts is available for this pump, including the diaphragm, the inlet valve and its plate, the outlet valve and its screws, the top cover gasket, as well as repair kits such as the foot kit or the bellows kit. These parts are usually available from your supplier.

This Whale product is covered by a 5-year warranty from the date of purchase. This warranty covers parts and labor, except for rubber components.

This pump is primarily designed to pump water. If you intend to use it for other liquids, it is your responsibility to ensure that the pump is suitable for that specific use and, above all, that the pump materials are fully compatible with the liquids you wish to handle.

The suction hose must be positioned so that it does not suck against a flat surface. To optimize suction and help evacuate the last drop of water, it is recommended to use a Whale strainer, available separately.

The outlet pipe must be connected to a through-hull fitting located well above the waterline, preferably in the transom. It is also recommended to incorporate a non-return valve in the line to eliminate the risk of siphoning.

To replace the rubber parts, start by removing the top cover, the pump body, and the locknut from the yoke. You can then replace the worn diaphragm, ensuring that both diaphragm plates have the rounded side facing the diaphragm. Next, remove and replace the inlet valve and its plate. For the outlet valve, unscrew the four screws around the outlet fitting, replace the valve, and secure it with the four new screws provided. Finally, reassemble the body onto the rear cover and tighten all assembly screws and the locknut on the yoke. The top cover gasket must also be replaced and firmly screwed in.

Several additional accessories are available to enhance the installation of this pump, including:

A watertight seal for the deck-mounted model (DP9906).A 38 mm thru-hull fitting (SF5425).Top-side (SB5865) and side (SB4222) bilge inlet strainers.A 2-way 38 mm bypass valve (DV5606).A 90° 38 mm elbow (EB3488).A "Y" piece (YP6114).An inline check valve (LV1215).

The top cover of the pump must be easily accessible. This accessibility is critical in case of clogging or maintenance needs, allowing quick access to check and clear the pump if it becomes blocked.