Aftermarket Parts
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Seastar Elbow Fit.Tube 3/8 Npt Male Hf5534
Seastar
$47.89 $37.99Seastar Elbow Fit.Tube 3/8 Npt Male Hf5534All Older Style SeaStar manual hydraulic steering systems. These are 3/8" compression fittings which utilize a 9/16"-24 extra fine thread. (Seastar Solutions New Updated cylinders with part numbers ending in "-3"...- Part Number:
- 1-HF5534
- Availability:
- In Stock - Ships same or next business day.
- Type:
- Elbow Fitting
- Material:
- Brass
- Bag:
- 3
$47.89 $37.99 -
Seastar Hose Kit-2Pc Seastar O/B 6 Ft Ho5106
Seastar
$201.59 $147.95Seastar Hose Kit-2Pc Seastar O/B 6 Ft Ho5106 Includes two hoses - can be used with all SeaStar systems, except SeaStar PRO, BayStar, Capilano and 3-line inboard systems. ID of 5/16".- Part Number:
- 1-HO5106
- Availability:
- In Stock - Ships same or next business day.
- Length:
- 6'
- Box:
- 2
$201.59 $147.95 -
Seastar Seal Kit F/Hc5313-Old #Hs0773 Hs5155
Seastar
$85.59 $62.93Seastar Seal Kit F/Hc5313-Old #Hs0773 Hs5155- Part Number:
- 1-HS5155
- Availability:
- In Stock - Ships same or next business day.
$85.59 $62.93 -
Seastar Twin Mt3 Top Mount Dual Func Lev Ch5300P
Seastar
$960.49 $644.72Seastar Twin Mt3 Top Mount Dual Func Lev Ch5300P Combines classic binnacle styling with dual function levers, a neutral safety switch, and an engine warm-up feature. Now features longer shift travel for certain MerCruisers or longer runs with many bends...- Part Number:
- 1-CH5300P
- Availability:
- In Stock - Ships same or next business day.
- Description:
- Twin Control - Dual Function
$960.49 $644.72 -
Special Order! See availaility for details
Sherwood Pump Raw Water Pump Cummins Qsb P2708X
Sherwood Pump
$1,232.89 $930.24Sherwood Pump Pump-Cummins Qsb P2708X Impeller Kit: 27000K Minor Repair Kit: 25125 Major Repair Kit: 25126 Sold w/o port elbows- Part Number:
- 762-P2708X
- Availability:
- In Stock - Ships same or next business day.
- Engine:
- Cummins QSB
- Replaces:
- P2701X
$1,232.89 $930.24 -
Sierra Amega Tachometer 7Krpm-Gas Ob-Io-Ib 58255P
Sierra
$148.39 $92.98Sierra Amega Tachometer 7Krpm-Gas Ob-Io-Ib 58255PSmart white and red graphics on a black dial background; these very low profile bezels follow the curve of the lenses to eliminate water trapping. Design with domed glass sheds water and resists scratching...- Part Number:
- 11-58255P
- Availability:
- In Stock - Ships same or next business day.
- Size:
- 3"
- Type:
- Tachometer
- Dial Range:
- 0-7000 rpm
- Sender Code:
- O/B Alt or Coil
$148.39 $92.98 -
Sierra Belt MerCruiser 57-69143Q OMC 311606 18-15400
Sierra
$39.49 $26.69Sierra Belt MerCruiser 57-69143Q OMC 311606 18-15400High strength synthetic cords resist shockload failure.The compression section is a special rubber compound that assures smooth and even transfer of load forces to the cords.Cogs are molded to precise...- Part Number:
- 47-15400
- Availability:
- In Stock - Ships same or next business day.
- Eff. Length:
- 40"
- Top Width:
- 29/64"
- OEM #:
- 57-32850 - 57-69143T - OMC 311606
$39.49 $26.69 -
Sierra C-Water Pump Kit-Mc & Mercury 18-3317
Sierra
$87.89 $61.22Sierra C-Water Pump Kit-Mc & Mercury 18-3317- Part Number:
- 47-3317
- Availability:
- In Stock - Ships same or next business day.
- Replaces:
- 46 96148A 8
$87.89 $61.22 -
Sierra Engine Coupler-Omc/Vp#3858437 18-21752-1
Sierra
$397.19 $288.37Sierra Engine Coupler-Omc/Vp#3858437 18-21752-1- Part Number:
- 47-217521
- Availability:
- In Stock - Ships same or next business day.
- Description:
- Engine Coupler - Replaces OMC 3858437 - 986120 - 3853917 - 984290
$397.19 $288.37 -
Sierra Filter Fuel W/Brkt 3/8 18-7857-1
Sierra
$17.09 $12.13Sierra Filter Fuel W/Brkt 3/8 18-7857-1- Part Number:
- 47-78571
- Availability:
- In Stock - Ships same or next business day.
- Replaces:
- A.C. Delco GF-61P
- Application:
- 3/8" Fuel line
$17.09 $12.13 -
Sierra Fuel Filter (Inline) 18-7712
Sierra
$19.89 $14.80Sierra Fuel Filter (Inline) 18-7712- Part Number:
- 47-7712
- Availability:
- In Stock - Ships same or next business day.
- Replaces:
- Mercury/Mariner 35-16248
- Application:
- 4/5 2 cyl (1999 & Up) - 4/5/6 4 stroke (1999 & Up) - 8/9.9 4-stroke (2005 & Up)
$19.89 $14.80 -
Sierra Hose Barb 3/8 X 3/8 Male 18-8108
Sierra
$8.99 $6.86Sierra Hose Barb 3/8 X 3/8 Male 18-8108NOT TO BE USED IN POTABLE WATER SYSTEMS.- Part Number:
- 47-8108
- Availability:
- In Stock - Ships same or next business day.
- Connector:
- Hose Barb - Male
- Replaces:
- -
- Thread:
- 3/8" NPT
- Hose:
- 3/8" Barb
$8.99 $6.86 -
Sierra Impeller-Pcm I/O-Mc47-89984T 4 18-3017
Sierra
$31.69 $21.57Sierra Impeller-Pcm I/O-Mc47-89984T 4 18-3017- Part Number:
- 47-3017
- Availability:
- In Stock - Ships same or next business day.
- Fits:
- All #1 - R - MR - Alpha Units thru S/N D494568
- Replaces:
- 47-89984 - 47-89984T4 - 47-30221 - 47-65960
$31.69 $21.57 -
Sierra Marine Solenoid-Ym6G1819411000 & MerCruiser 18-5821
Sierra
$107.19 $70.06Sierra Solenoid-Ym6G1819411000 & MerCruiser 18-5821- Part Number:
- 47-5821
- Availability:
- In Stock - Ships same or next business day.
- Replaces:
- 89-825096T - 825096T01
- Application:
- 9.9 4-Stroke (1999 & Up) - 15 4-stroke (1999 & Up) - 30 4-stroke (2002 & Up) -40/50/60 4-stroke (2001 & Up) - 75/90 4-stroke (2000 & Up).
$107.19 $70.06 -
Sierra Oil 25W40 FCW I/O-I/B
Sierra
$14.79 $13.99Sierra Oil-25W40 FCW I/O-I/B Qt 18-9400-2- Part Number:
- NW-SPB25W40
- Availability:
- In Stock - Ships same or next business day.
- Grade:
- 25W40
$14.79 $13.99 -
Sierra OMC Exhaust Hose 912374 18-2745
Sierra
$45.29 $37.03Sierra OMC Exhaust Hose 912374 18-2745- Part Number:
- 47-2745
- Availability:
- In Stock - Ships same or next business day.
$45.29 $37.03 -
Sierra Outdrive Seal MerCruiser 12708 18-1240
Sierra
$16.59 $12.41Sierra Outdrive Seal MerCruiser 12708 18-1240- Part Number:
- 47-1240
- Availability:
- In Stock - Ships same or next business day.
- Description:
- Mercruiser: For Bravo. Replaces 12708.
$16.59 $12.41 -
Sierra Overhaul Kit-Velvetdrive 71-72 18-2591
Sierra
$570.39 $396.49Sierra Overhaul Kit-Velvetdrive 71-72 18-2591Service kit for Borg-Warner Velvet Drive 71 and 72 series transmission.- Part Number:
- 47-2591
- Availability:
- In Stock - Ships same or next business day.
- Includes:
- Gaskets - Seals - Sealing rings - Bronze and Steel plates
$570.39 $396.49 -
Sierra Pan Gasket 1Pc GM 3L 18-1239
Sierra
$155.39 $123.47Sierra Pan Gasket 1Pc GM 3L 18-1239- Part Number:
- 47-1239
- Availability:
- In Stock - Ships same or next business day.
$155.39 $123.47 -
Sierra Points Merc/Omc/Vp Mly W/Stra 18-5314
Sierra
$18.89 $15.24Sierra Points Merc/Omc/Vp Mly W/Stra 18-5314- Part Number:
- 47-5314
- Availability:
- In Stock - Ships same or next business day.
$18.89 $15.24
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.