Jabsco 50890 Series Waste Pump Service Kit, Single Diaphragm

Overview

The Jabsco SK890 is a service kit for rebuilding the 50890 series single diaphragm waste pump. It replaces the service parts around the diaphragm chamber and flow path, including the diaphragm, cover, joker valves, ports, and the related fasteners and washer.

This is the practical repair option when the installed 50890 series pump still has a serviceable motor and mounting setup, but the pump-side wear parts need attention. The 50890 pump uses 1-1/2 in (38 mm) hose connections, and this kit includes the two replacement ports used in that layout.

On boats with a sanitation system that already depends on the 50890 series pump, this kit helps you rebuild the parts most likely to be opened during service without replacing the full pump.

Key features

• Fits Jabsco 50890 series waste pumps with the single diaphragm design.
• Replaces the main service items in the diaphragm chamber and valve path rather than only one wear part.
• Includes two pump ports for the 1-1/2 in (38 mm) connection size used on the 50890 pump.
• Suited to a pump rebuild when the service parts need replacement but the motor assembly does not.
• Useful for planned maintenance or for restoring an existing pump already installed in the boat’s sanitation system.

Compatibility and fit

This kit is for the Jabsco 50890 series waste pump with the single diaphragm layout. It matches the service-kit items shown for that pump family and covers the pump-side components, not the separate motor assembly.

Before ordering, check the pump series on the installed unit, especially on boats that have had sanitation parts changed over time. This is a series-specific rebuild kit, not a universal Jabsco waste pump repair kit.

Installation and service

Service work should be done with power disconnected and the pump isolated from the system. On the 50890 pump, the hose layout uses 1-1/2 in (38 mm) non-collapsible waste hose, and airtight suction-side connections matter for pump performance after reassembly.

This kit makes sense during routine pump service, hose replacement, or a sanitation system inspection when the diaphragm and valve parts are already being checked. It is a good fit for boats that rely on the 50890 series pump and need a straightforward rebuild of the serviceable pump components.

What’s included

• 1 cover
• 1 diaphragm
• 4 hex head screws
• 1 recessed pan head screw
• 1 washer
• 2 pump joker valves
• 2 pump ports

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Orders of $100 or more qualify for free shipping when eligible. For orders under $100, shipping costs are calculated at checkout based on destination, package weight, and selected service. International shipping is available for eligible products, and certain items may require additional handling, warehouse transfers, or may ship directly from the manufacturer, which can affect processing time.

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We ship throughout the United States and to most international destinations for products eligible for international shipping. International orders may be subject to customs duties, taxes, brokerage charges, or other import fees, which are the customer's responsibility and are not included in the product or shipping price. PO Boxes are accepted only when shipping through USPS, and not all packages qualify for this option. If your order does not arrive within the estimated delivery window, please contact us at info@apollolighting.com or +1 (954) 375-0100 so we can assist with locating your package.

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Returns may be requested within 30 days of receiving your order. Items must be unused, uninstalled, unaltered, and returned in their original packaging with all tags, packing materials, blank warranty cards, manuals, instructions, accessories, and included items. Certain products, including installed or used electronics, electrical components, lighting, consumables, custom or special-order items, cut-to-length products, safety equipment, and merchandise exposed to water or marine conditions, may not be eligible for return.

To request a return, sign in to your account and select the applicable order and items, and submit your request for review. Eligible unfulfilled items may also be submitted for cancellation within 1 hour of placing the order. Returns or cancellations are not considered approved until you receive confirmation from Apollo Lighting. Please do not ship or drop off merchandise before receiving return approval and instructions.

Customers are responsible for arranging and paying for return shipping unless the return is due to an error by Apollo Lighting or the item is verified as defective, damaged, or incorrect. Missing, damaged, defective, or incorrect items must be reported within 2 business days of delivery, and photos or other documentation may be required for review. If the issue is verified, Apollo Lighting may provide or reimburse return shipping and issue a replacement or refund depending on the circumstances. International customers are responsible for return shipping, duties, taxes, customs charges, brokerage fees, and other costs associated with an international return.

After your return is received and inspected, approved refunds are issued to the original payment method and may take 5-7 business days to appear after processing. Original shipping and handling charges are nonrefundable, and the value of any included free items that are not returned may be deducted from the refund. Apollo Lighting does not charge a standard restocking fee on eligible returns. Returns that are incomplete, damaged, installed, used, altered, improperly packaged, or otherwise do not meet the eligibility requirements may be refused. We recommend using a trackable and appropriately insured shipping service for all customer-arranged returns.

For assistance, contact info@apollolighting.com or call +1 (954) 375-0100.

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Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

Keep your receipt, product documentation, serial number information, and original packaging when practical. Damage caused by normal wear, misuse, improper installation, insufficient maintenance, corrosion, impact, unauthorized modifications, electrical issues, or operation outside the manufacturer's specifications may not be covered. Warranty claims are separate from standard returns, so a product that has been installed, used, or exposed to marine conditions may no longer qualify for return while still remaining eligible for evaluation under the manufacturer's applicable warranty.

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