Preparation / liveaboard checklist
25 Must-Have Liveaboard Spare Parts: A System-by-System Checklist
A useful spare is not a universal brand-name shopping list. It is a part you can identify, store correctly, and match to the pump, engine, toilet, electrical system, or deck hardware actually aboard your boat. This checklist helps you start a boat-specific inventory rather than buy parts that do not fit.
Printable checklist
Take the 25-part inventory aboard.
A clean, no-email-gate PDF with checkboxes, product-line prompts, and pre-departure reminders.
Safety callout
Know when this is not a DIY decision.
- Do not install a spare where the system, fitting, voltage, fuel type, pressure rating, or thread standard is uncertain. Confirm the original part and manufacturer documentation first.
- For fuel, electrical, sanitation, and below-waterline systems, isolate and service only within your experience and the equipment manufacturer’s process. Escalate leaks, overheating, corrosion, or through-hull uncertainty.
- Store parts dry, labeled, protected from contamination, and away from ignition or heat sources when the item’s manufacturer requires it.
Tools & materials
Stage only what the job calls for.
- A boat-specific inventory list with manufacturer, model, serial/reference number, and installed part number where available
- Photos and measurements of existing fittings, hose sizes, thread standards, terminal types, and filter elements
- Labeled storage bins or bags that preserve packaging, instructions, and expiration or replacement notes
- The relevant service manuals and a small set of tools you already know are correct for the equipment aboard
Decision process
How to turn a generic list into usable spares
Before ordering, trace each item to the system that uses it. A spare counts only when its specification and fitment match the installed component.
1. Start with a failure that stops the system
- Prioritize components that can leave you without water, bilge control, charging, propulsion support, sanitation, or a weather-tight deck function.
- Choose based on your actual operating area, service access, and redundancy—not a claim that every boat has identical needs.
2. Capture fitment before buying
- Record model numbers, hose IDs, thread types, electrical ratings, filter numbers, dimensions, and connector styles from the installed equipment.
- Keep the source document or packaging with the spare so the next person can verify it before installation.
3. Check storage and rotation
- Some items age, dry out, corrode, or have a defined shelf life. Follow the manufacturer’s storage requirements and inspect your inventory routinely.
- Replace a spare after you use it, and update the inventory when you replace equipment or fittings aboard.
25-spare-parts checklist
Specific product lines—only after fitment checks.
These are practical examples, not sponsored endorsements. Cross-check your systems manuals, installed part numbers, dimensions, electrical specifications, and local requirements before ordering or installing anything.
Fresh water
- 01
Freshwater pump service kit
Brand pick: SHURFLO Revolution 4008-specific service parts
Supports service of the Hespera Fix preferred freshwater-pump family when the installed pump is a matching Revolution model.
Fit/use: Match the exact pump model and revision. Existing Jabsco, Johnson, Whale, or other installed pumps remain model-specific exceptions; do not force SHURFLO parts into another pump family.
- 02
Pump strainer and faucet screen spares
Brand pick: SHURFLO-compatible inlet strainer for the installed pump
Keeps debris from reducing flow at the preferred pump inlet.
Fit/use: Match the actual strainer body, port thread, hose, and potable-water use. Faucet aerators remain fixture-specific and are not a pump-brand substitution.
- 03
Potable-water pipe joiner
Brand pick: Existing-system manufacturer-approved fitting
Supports a controlled repair to the pipe system actually installed aboard.
Fit/use: Whale Quick Connect remains an allowed exception for Whale 15 mm systems only; do not substitute it for flexible hose, PEX, or a different pipe diameter.
- 04
Potable-water hose clamps
Brand pick: Ideal-Tridon 300-series stainless worm-drive clamps
Secures a verified low-pressure hose connection.
Fit/use: Select the clamp range for the actual hose OD and fitting; use only materials suitable for potable-water service and installed access.
Bilge
- 01
Bilge circuit fuse
Brand pick: Blue Sea Systems ATO/ATC or MRBF fuse family
Replaces a correctly specified overcurrent device after the fault is found.
Fit/use: Match the installed holder, DC voltage, amp rating, interrupt rating, and pump wiring plan—never increase fuse size to stop nuisance blows.
- 02
Bilge float switch
Brand pick: Rule-A-Matic Plus float switch
Restores automatic pump control on a compatible Rule-style bilge setup.
Fit/use: Check pump current, system voltage, mounting footprint, and intended switching arrangement; keep the bilge clear of debris.
- 03
Bilge hose joiner and clamps
Brand pick: Marelon straight hose connector with AWAB Original clamps
Supports a contained repair of an existing discharge run.
Fit/use: Match connector barb and clamp range to the discharge hose ID/OD and material; confirm the discharge routing and any anti-siphon requirement.
- 04
Bilge pump service component
Brand pick: Rule-Mate model-specific replacement or service part
Supports the Hespera Fix preferred bilge-pump family when the installed pump is a matching Rule-Mate model.
Fit/use: Existing Johnson, Whale, or other installed systems remain model-specific exceptions. Match voltage, base, outlet, wiring connector, discharge plan, and required capacity before replacement.
Electrical
- 01
Appropriately rated fuses
Brand pick: Blue Sea Systems ANL, MRBF, or ATO/ATC fuse lines
Restores circuit protection after diagnosing the cause of an open fuse.
Fit/use: Fuse family, rating, DC voltage, interrupt capacity, and holder must match the protected circuit and the system documentation.
- 02
Heat-shrink terminals
Brand pick: Ancor Marine Grade heat-shrink terminals
Repairs a verified low-voltage termination with marine-grade insulation.
Fit/use: Match conductor gauge, terminal type, stud size, and crimp-tool die; isolate power and follow the boat's wiring diagram first.
- 03
Battery terminal hardware
Brand pick: Blue Sea Systems PowerPost and battery terminal hardware
Replaces corroded or missing connection hardware in a documented battery connection.
Fit/use: Match stud size, conductor lugs, torque, voltage, and cover/insulation arrangement; do not alter battery-bank protection design.
- 04
Navigation-light service part
Brand pick: Aqua Signal replacement bulbs and lenses
Restores a compatible installed navigation-light fixture.
Fit/use: Identify fixture series, bulb base, voltage, color, and visibility approval before packing a spare; an LED fixture may not have a replaceable bulb.
Engine & fuel
- 01
Primary fuel filter element
Brand pick: Parker Racor Turbine Series replacement elements
Replaces the element in a compatible diesel fuel/water separator.
Fit/use: Match the Turbine housing series and selected micron rating to engine guidance; prime and service the system per the engine and filter manuals.
- 02
Secondary engine fuel filter
Brand pick: Yanmar Genuine Parts fuel-filter element
Keeps a Yanmar engine's secondary filtration serviceable.
Fit/use: For Yanmar engines only; confirm the engine model, serial range, element number, gasket, and bleed procedure from the engine manual.
- 03
Raw-water pump impeller
Brand pick: Jabsco impeller service kit
Restores a compatible raw-water pump's flexible impeller and related service parts.
Fit/use: Match the pump model, cover, gasket/O-ring, spline, and rotation; retrieve missing vane pieces before operating if an impeller fails.
- 04
Drive belt
Brand pick: Gates V-Belt or Micro-V belt line
Replaces a documented accessory-drive belt.
Fit/use: Match belt profile, effective length, rib count, and accessory layout to the engine manual or removed belt—not only a similar engine family.
- 05
Engine hose and clamps
Brand pick: Trident Marine hose by application with AWAB Original clamps
Supports a limited repair to a known cooling, wet-exhaust, fuel-fill, or other rated hose run.
Fit/use: Select hose for the actual fluid, temperature, pressure, and hose ID; use only the matching Trident application line and replace aged hose rather than patching it.
Sanitation
- 01
Manual-toilet service kit
Brand pick: Jabsco manual toilet service kit
Renews service parts in a compatible Jabsco manual head.
Fit/use: Confirm the toilet series, pump version, joker-valve orientation, and kit part number; follow local discharge and waste-handling rules.
- 02
Sanitation hose clamps
Brand pick: AWAB Original 316 stainless clamps
Secures a verified sanitation-hose connection.
Fit/use: Size for the actual sanitation hose OD and fitting; inspect access, double-clamping needs, corrosion, and local sanitation requirements.
- 03
Macerator or discharge-pump repair part
Brand pick: Jabsco macerator pump service kit
Provides service components for a compatible installed macerator pump.
Fit/use: Match the pump model, voltage, hose ports, and kit number; isolate DC power and follow the pump and local discharge requirements.
- 04
Tank vent filter
Brand pick: Existing-system manufacturer-compatible vent filter
Helps control odor in a compatible holding-tank vent system without changing the sanitation design.
Fit/use: Confirm the existing vent-hose size, installation arrangement, and service guidance. A restricted vent can harm tank performance, so do not substitute a filter simply to match a preferred brand.
Deck & general
- 01
Hatch or portlight gasket
Brand pick: Lewmar hatch seal kit
Renews weather sealing on a compatible Lewmar hatch.
Fit/use: Match the hatch series, size, and seal profile; a gasket does not correct a distorted frame, failed acrylic, or wet deck core.
- 02
Deck hardware fasteners and washers
Brand pick: Suncor 316 stainless fastener line
Replaces known deck-hardware fastening components.
Fit/use: Match diameter, thread, length, head style, backing arrangement, material, and structural load; do not assume stainless grades are interchangeable.
- 03
Compatible bedding compound
Brand pick: 3M Marine Adhesive Sealant 4000 UV
Hespera Fix's practical default for compatible, non-structural marine bedding and sealing jobs that need a serviceable seal.
Fit/use: Confirm every substrate, load path, UV exposure, cure process, and manufacturer instruction first. This is not a universal sealant; hatch glazing, structural bonds, fuel systems, and excluded plastics require the specified product or method.
- 04
Spare drain plug or scupper component
Brand pick: Sea-Dog threaded drain-plug assemblies
Restores a compatible threaded drain or cockpit-scupper component.
Fit/use: Match thread, material, retention method, and installation location; do not substitute a drain fitting in a below-waterline or load-bearing application.
Step-by-step
Build and maintain your onboard spare kit
- 01
Walk the boat by system and photograph the installed part labels before you order anything. Add those details to a simple inventory document.
- 02
Compare each possible spare to the part currently installed, its manual, and its operating conditions. Confirm it will fit and is suitable for your boat’s voltage, fuel, pressure, thread, material, or hose size as applicable.
- 03
Buy a practical quantity based on likely use, storage space, and the consequence of being without the part. Avoid buying a bin of unverified near-matches.
- 04
Label each spare with its system, exact equipment match, quantity, purchase date if useful, and the place it is stored. Keep installation instructions with parts that are easy to misorient or misuse.
- 05
Review the kit before a passage, after a repair, and whenever equipment changes. Replace used or damaged spares and remove items that no longer match the boat.
Common mistakes
Avoid making the second repair harder.
- Buying a popular spare part without matching it to the installed model, dimensions, voltage, hose, thread, or connector.
- Storing loose parts without labels, manuals, packaging, or a record of where they belong.
- Treating a spare as permission to service a safety-critical system without identifying the cause of the failure.
- Failing to replenish a spare after it is used or after equipment has been upgraded.
FAQ
Questions to settle before you start.
Do all liveaboards need every part on this list?
No. Use the list as a system-by-system prompt. Keep only parts that match equipment actually installed aboard and make sense for your cruising plans.
How many of each spare should I carry?
There is no universal quantity. Start with one correctly matched service spare for critical systems, then adjust for your equipment, storage, usage, distance from service, and manufacturer guidance.
Should I buy generic replacements to save money?
Only after you confirm the specifications and compatibility. A near-match can create a leak, electrical problem, premature failure, or a part you cannot safely install.
Author & method
Practical checks, clear stop points.
Hespera Fix is informed by a contractor-license background and firefighter/paramedic troubleshooting instincts: identify the system, isolate risk, confirm the next step, and avoid forcing an uncertain repair. This is practical educational guidance, not a substitute for manufacturer instructions or qualified marine service.
Membership CTA / expanded guides
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