Aftermarket Parts
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Martyr Anodes 1 1/2 Zinc Shaft Anode Cmx07
Martyr Anodes
$23.99 $17.09Martyr Anodes 1 1/2 Zinc Shaft Anode Cmx07 Aluminum for salt and brackish waterMagnesium for fresh waterZinc for salt water- Part Number:
- 194-CMX07
- Availability:
- In Stock - Ships same or next business day.
- ID:
- 1-1/2"
- OD:
- 2-1/2"
- Length:
- 2-1/2"
- Material:
- Zinc
$23.99 $17.09 -
Martyr Anodes 5 1/8 Zinc Rudder Anode Cmr05
Martyr Anodes
$63.39 $29.32Martyr Anodes 5 1/8 Zinc Rudder Anode Cmr05 Zinc: For use in salt waterAluminum: For use in brackish waterMagnesium: For use in fresh water- Part Number:
- 194-CMR05
- Availability:
- In Stock - Ships same or next business day.
- Size:
- 5-1/8" dia. x 7/8
- Material:
- Zinc
$63.39 $29.32 -
Martyr Anodes 8X4X3/4 Hull Anode Cmzhc5Az
Martyr Anodes
$111.69 $42.36Martyr Anodes 8X4X3/4 Hull Anode Cmzhc5AzZinc: For use in salt waterAluminum: For use in brackish waterMagnesium: For use in fresh water- Part Number:
- 194-CMZHC5AZ
- Availability:
- In Stock - Ships same or next business day.
- Size:
- 8" L x 4" W x 3/4" H
- Hole:
- 4-3/8"
- Material:
- Zinc
$111.69 $42.36 -
McGard Marine Single Outboard Motor Locks (M12 x 1.25 Thread Size) - Yamaha/Honda - 74037
McGard Locks
$52.59 $44.78McGard Locks Outboard Lock 50hp Yamaha & Up 74037 Designed to lock the outboard onto the transom, simply replace one of the mounting nuts with a McGard locking nut. A free spinning collar turns if attacked by gripping tools, protecting against theft...- Part Number:
- 371-74037
- Availability:
- In Stock - Ships same or next business day.
- Description:
- M12 x 1.25 Yamaha 40+ hp (2-stroke) - 30+ hp (4-stroke) - Honda 40+ hp - Suzuki 25-140 hp (2005 & newer)
- Finish:
- Stainless
$52.59 $44.78 -
Sold Out, please call for ETA.
NGK Spark Plugs 3478 Spark Plug 3478
NGK Spark Plugs
$16.99 $9.16NGK Spark Plugs 3478 Spark Plug 3478 Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life. •?Triple gasket sealing...- Part Number:
- 41-CR8EK
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 3478
- Pkg.:
- Boxed
- What's in the Box:
- (1) Spark Plug
$16.99 $9.16 -
NGK Spark Plugs 7131 Spark Plug 7131
NGK Spark Plugs
$6.39 $4.33NGK Spark Plugs 7131 Spark Plug 7131Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life.•?Triple gasket sealing process...- Part Number:
- 41-BPR6ES
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 7131
- Pack:
- 4
- Pkg.:
- Boxed
$6.39 $4.33 -
NGK Spark Plugs Bp8Hs-10 Spark Plug 3823
NGK Spark Plugs
$6.49 $4.49NGK Spark Plugs Bp8Hs-10 Spark Plug 3823 Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life. •?Triple gasket sealing...- Part Number:
- 41-BP8HS10
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 3823
- Pkg.:
- Boxed
- What's in the Box:
- (1) Spark Plug
$6.49 $4.49 -
Sold Out, please call for ETA.
OEM MerCruiser Power Trim Pump Harness Adapter 84-865771A02
Mercury Marine / Quicksilver
$17.16 $15.88OEM MerCruiser Power Trim Pump Harness Adapter 84-865771A02 This adapter will adapt from old style round 3 prong to the new style flat plug This trim adapter converts the traditional Mercury trim plug to the Delphi connector Please confirm...- Part Number:
- 710-84-865771A02
- Availability:
- In Stock - Ships same or next business day.
$17.16 $15.88 -
Sold Out, please call for ETA.
Racor Filter Optimax/Verado 2Mic 2Pk 31871
Racor
$79.99 $64.24Racor Filter Optimax/Verado 2Mic 2Pk 31871 Product Features: Legendary Aquabloc®II, 2 micron filter media, removes up to 100% of free water and protects sensitive fuel system components from particulates Meets or exceeds OEM...- Part Number:
- 62-31871
- Availability:
- In Stock - Ships same or next business day.
- Replaces:
- Mercury 35-884380T or 35-8M0020349
- Pack:
- 2
$79.99 $64.24 -
Seachoice Oil Change Pump 19181
Seachoice
$30.30 $24.05Seachoice Oil Change Pump 19181 For emptying oil from inboard and I/O enginesMade of solid brass with removable tubing for ease of operation and cleaning.- Part Number:
- 50-19181
- Availability:
- In Stock - Ships same or next business day.
$30.30 $24.05 -
Seastar Ball Knob Red 4009912
Seastar
$19.32Seastar Ball Knob Red 4009912 Replacement control knobs fit most controls with 3/8-24 threaded handles.- Part Number:
- 1-4009912
- Availability:
- In Stock - Ships same or next business day.
- Description:
- Red Ball Knob Replacement
$19.32 -
SeaStar HK4300A-3 BayStar Compact Hydraulic Steering System Kit NO Hoses
Seastar
$1,072.09 $963.99Baystar Kit, HK4300A-3 Hydraulic Steering Kit without Tube Baystar Steering Kit: With mechanical steering you sacrifice a degree of comfort. Traditional hydraulic systems may be more than is needed on lower horsepower outboard engines. Built in the...- Part Number:
- 1-HK4300A3
- Availability:
- In Stock - Ships same or next business day.
- Includes:
- HH43143 Std Helm w/o Hoses
$1,072.09 $963.99 -
Seastar Power Assist Unit-Seastar 12V Pa1200-2
Seastar
$2,694.99Seastar Power Assist Unit-Seastar 12V Pa1200-2 The SeaStar Power Assist unit virtually eliminates all steering loads on the wheel and reduces steering effort in heavy or high torque applications to reduce driver fatigue and discomfort, just like in a car...- Part Number:
- 1-PA12002
- Availability:
- In Stock - Ships same or next business day.
- Description:
- 12/24V with 15' Harness
$2,694.99 -
Sierra Fuel Filter 18-7865
Sierra
$18.79 $12.28Sierra Fuel Filter 18-7865- Part Number:
- 47-7865
- Availability:
- In Stock - Ships same or next business day.
- Description:
- Repl. Filter
- Replaces:
- Yamaha MAR-MINIF-IL-TR
- Size:
- 10 Micron
$18.79 $12.28 -
Sierra Gasket-Exhaust Manifold GM7.4-8.2L 18-0418
Sierra
$24.19 $19.47Sierra Gasket-Exhaust Manifold GM7.4-8.2L 18-0418- Part Number:
- 47-0418
- Availability:
- In Stock - Ships same or next business day.
$24.19 $19.47 -
Sold Out, please call for ETA.
Sierra Gasket-Water Pump GM 4.3L-5.7L 18-0891
Sierra
$1.81Sierra Gasket-Water Pump GM 4.3L-5.7L 18-0891- Part Number:
- 47-0891
- Availability:
- In Stock - Ships same or next business day.
$1.81 -
Sierra Riser Spacer-3In Marine Power Cr 18-1908
Sierra
$206.89 $174.72Sierra Riser Spacer-3In Marine Power Cr 18-1908- Part Number:
- 47-1908
- Availability:
- In Stock - Ships same or next business day.
- Application:
- Mercruiser GM V6 229 and 262 CID (models 185 and 205) - GM small block V8 - 305-350 CID (models 200 - 228 - 230 - 260 and 898) - GM big block V8 - 454 CID (models 330 - 340 and 7.4L). Use with manifold 19521 - 19531 - 19571
$206.89 $174.72 -
Sierra Switch Oil Pressure 6Psi Trip Op22900
Sierra
$23.29 $20.33Sierra Switch Oil Pressure 6Psi Trip Op22900Used for Electric Fuel Pump Shut Off. Thread size: 1/8" - 27 Terminal type: 10-32 stud- Part Number:
- 11-OP22900
- Availability:
- In Stock - Ships same or next business day.
- Description:
- Set at 6 psi
$23.29 $20.33 -
Sierra T Wrench Spanner Nut (Tool) 18-9803
Sierra
$138.89 $112.76Sierra T Wrench Spanner Nut (Tool) 18-9803Replaces: Mercury Mariner 91-17256Removes and installs driveshaft bearing retainer on MC-1; R-MR; Blackhawk; all Bravo and all Alpha drive units.- Part Number:
- 47-9803
- Availability:
- In Stock - Ships same or next business day.
$138.89 $112.76 -
Sierra Tune Up Kit OMC 172523 18-5002
Sierra
$42.89 $22.79Sierra Tune Up Kit OMC 172523 18-5002Contains: Contact sets (2); condenser (2)- Part Number:
- 47-5002
- Availability:
- In Stock - Ships same or next business day.
- Application:
- 18-40 HP various models 1962-1976
- Replaces:
- OMC 172523
$42.89 $22.79
Aftermarket Boat Parts & Marine Engine Supplies
Looking for dependable aftermarket boat parts? PowerBoatSupply.com carries a wide selection of aftermarket marine parts, engine supplies, oils, fuel components, steering parts, anodes, tools, and maintenance essentials for boat owners and marine professionals.
Whether you're handling routine service, replacing worn components, or stocking up for the season, our aftermarket parts selection helps keep your boat running smoothly and reliably.
Marine Engine Parts & Maintenance Essentials
Keep your motor protected and performing with key maintenance categories like engine parts, motor oil, marine oil systems and accessories, and lubricants, fluids and sealants.
- Engine Parts – Replacement components for service and repair
- Motor Oil – Marine-grade oils for routine maintenance
- Oil Systems & Accessories – Helpful products for oil changes and upkeep
- Lubricants, Fluids & Sealants – Protect, seal, and maintain marine systems
Fuel, Steering & Control Parts
Reliable fuel delivery and responsive steering are critical on the water. Browse marine fuel parts and steering and controls to help maintain safer handling, smoother operation, and dependable performance.
- Fuel Parts – Components for reliable fuel system performance
- Steering & Controls – Parts that help improve control and handling
- Engine Instruments – Monitor key systems while underway
- Engine Tools – Tools for maintenance, repair, and service work
Anodes, Instruments & Service Tools
Small parts can make a big difference in long-term protection and performance. Shop marine anodes, engine instruments, and engine tools to help protect your boat, monitor performance, and complete service work more efficiently.
- Anodes – Help protect metal components from corrosion
- Engine Instruments – Gauges and monitoring products for marine engines
- Engine Tools – Service tools for DIY boaters and marine technicians
- Maintenance Supplies – Everyday essentials for seasonal upkeep
Yamaha Oil Change Kits & Routine Service Products
Staying ahead of routine service is one of the best ways to protect your investment. PowerBoatSupply.com also carries Yamaha oil change kits and other service products that make maintenance easier and more convenient.
- Oil Change Kits – Convenient service kits for scheduled maintenance
- Marine Oils – Protect engines under real boating conditions
- Sealants & Fluids – Support repairs, installs, and regular service
- Tools & Accessories – Make maintenance faster and cleaner
Why Buy Aftermarket Marine Parts from PowerBoatSupply.com?
PowerBoatSupply.com helps boat owners find reliable parts and maintenance products without the guesswork. From routine oil service to engine repair, fuel system work, corrosion protection, and steering maintenance, our aftermarket category is built to support the jobs boaters handle every season.
- Wide selection of aftermarket boat parts and marine supplies
- Products for DIY boat owners and marine professionals
- Helpful categories for seasonal service and repairs
- Fast shipping and dependable support
Shop aftermarket boat parts today and get the engine parts, oils, fuel components, steering supplies, anodes, tools, and maintenance products you need to keep your boat ready for the water.