-17% sale
Sierra Not Qualified for Free Shipping Sierra Water Cover Gasket #18-3899
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Water Cover Gasket #18-3899 $9.80 $11.69
Sierra 18-3899 Engine Gaskets Water Cover Gasket For: 20, 25, 25C, 30, 35 OEM Interchange:OMC: 327674 Normalized SKU: 183899UPC Code: 808282244118
-17% sale
Sierra Not Qualified for Free Shipping Sierra Head Gasket #18-3856
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Head Gasket #18-3856 $42.00 $50.40
Sierra 18-3856 Engine GasketsHead GasketOEM Interchange:CHRYSLER FORCE: 27-F201529-1Sierra Head Gasket #18-3856Normalized SKU: 183856UPC Code: 808282244071
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket 2-pk #18-2949-9
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket 2-pk #18-2949-9 $30.60 $36.52
Sierra 18-2949-9 Engine GasketsExhaust Manifold Gasket (Priced Per Pkg of 2)Sierra Exhaust Manifold Gasket (Priced Per Pkg of 2) #18-2949-9Normalized SKU: 1829499UPC Code: 808282164355
-15% sale
Sierra Qualifies for Free Shipping Sierra Drain Screw Gasket 2-pk #18-2945-9
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Drain Screw Gasket 2-pk #18-2945-9 $2.38 $2.80
Sierra 18-2945-9 Engine GasketsDrain Screw Gasket (Priced Per Pkg of 2)Sierra Drain Screw Gasket (Priced Per Pkg of 2) #18-2945-9Normalized SKU: 1829459UPC Code: 808282164324
Sold out -17% sale
Sierra Not Qualified for Free Shipping Sierra Cover Plate Gasket 2-pk #18-2929-9
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Cover Plate Gasket 2-pk #18-2929-9 $10.03 $11.97
Sierra 18-2929-9 Engine GasketsCover Plate Gasket (Priced Per Pkg of 2)Sierra Cover Plate Gasket (Priced Per Pkg of 2) #18-2929-9Normalized SKU: 1829299UPC Code: 808282164225
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Cover Gasket 2-pk #18-2866-9
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Cover Gasket 2-pk #18-2866-9 $28.86 $34.45
Sierra 18-2866-9 Engine GasketsExhaust Cover Gasket (Priced Per Pkg of 2)Sierra Exhaust Cover Gasket (Priced Per Pkg of 2) #18-2866-9Normalized SKU: 1828669UPC Code: 808282163716
-16% sale
Sierra Not Qualified for Free Shipping Sierra Manifold End Cap Gasket 2-pk #18-2850-9
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Manifold End Cap Gasket 2-pk #18-2850-9 $7.24 $8.52
Sierra 18-2850-9 Engine GasketsManifold End Cap Gasket (Priced Per Pkg of 2)Sierra Manifold End Cap Gasket (Priced Per Pkg of 2) #18-2850-9Normalized SKU: 1828509UPC Code: 808282163556
-17% sale
Sierra Not Qualified for Free Shipping Sierra Block Cover Gasket 2-pk #18-2810-9
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Block Cover Gasket 2-pk #18-2810-9 $28.41 $33.91
Sierra 18-2810-9 Engine GasketsBlock Cover Gasket (Priced Per Pkg of 2)Sierra Block Cover Gasket (Priced Per Pkg of 2) #18-2810-9Normalized SKU: 1828109UPC Code: 808282163273
-17% sale
Sierra Not Qualified for Free Shipping Sierra Outdrive Mounting Gasket #18-2743
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Outdrive Mounting Gasket #18-2743 $10.21 $12.19
Sierra 18-2743 Engine GasketsOutdrive Mounting GasketOEM Interchange:MERCURY MARINE: 27-94996-2MERCURY MARINE: 27-94996Q2Sierra Outdrive Mounting Gasket #18-2743Normalized SKU: 182743UPC Code: 030999775771
-16% sale
Sierra Not Qualified for Free Shipping Sierra Cylinder Head Gasket #18-2736
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Cylinder Head Gasket #18-2736 $6.85 $8.06
Sierra 18-2736 Engine GasketsCylinder Head GasketOEM Interchange:MERCURY MARINE: 27-863895Sierra CylIndustrialer Head Gasket #18-2736Normalized SKU: 182736UPC Code: 808282145224
-16% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket #18-2717
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket #18-2717 $7.70 $9.06
Sierra 18-2717 Engine Gaskets Exhaust Manifold Gasket For Mercury 15-25 Hp 2 cyl. and MERC 25XS OEM Interchange:MERCURY MARINE:27-4147527-41475-827-41475127-41475227-41475327-41475427-41475527-41475627-41475727-89215827-92331 Sierra Exhaust Manifold Gasket #18-2717 Normalized SKU: 182717UPC Code: 808282145811
-17% sale
Sierra Not Qualified for Free Shipping Sierra Drive Shaft Housing Gasket #18-2713
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Drive Shaft Housing Gasket #18-2713 $9.69 $11.56
Sierra 18-2713 Engine GasketsDrive Shaft Housing GasketOEM Interchange:MERCURY MARINE: 27-433374Sierra Drive Shaft Housing Gasket #18-2713Normalized SKU: 182713UPC Code: 808282145804
-15% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Cover Gasket #18-2714
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Cover Gasket #18-2714 $8.18 $9.62
Sierra 18-2714 Engine GasketsExhaust Cover GasketOEM Interchange:MERCURY MARINE: 27-41499-5Sierra Exhaust Cover Gasket #18-2714Normalized SKU: 182714UPC Code: 808282145293
Sold out -15% sale
Sierra Not Qualified for Free Shipping Sierra Thermostat Cover Gasket 2-pk #18-2555-9
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Thermostat Cover Gasket 2-pk #18-2555-9 $2.89 $3.40
Sierra 18-2555-9 Engine GasketsThermostat Cover Gasket (Priced Per Pkg of 2)Sierra Thermostat Cover Gasket (Priced Per Pkg of 2) #18-2555-9Normalized SKU: 1825559UPC Code: 808282162894
Sold out -22% sale
Sierra Not Qualified for Free Shipping Sierra Head Gasket Set #18-1267
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Head Gasket Set #18-1267 $206.79 $262.64
Sierra 18-1267 Engine GasketsHead Gasket SetSierra Head Gasket Set #18-1267Normalized SKU: 181267UPC Code: 808282242992
-17% sale
Sierra Not Qualified for Free Shipping Sierra Oil Pan Gasket #18-1237
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Oil Pan Gasket #18-1237 $56.76 $68.11
Sierra 18-1237 Engine GasketsOil Pan GasketOEM Interchange:CRUSADER: 7090380MERCURY MARINE: 27-138651OMC: 3856138VOLVO: 3856138Sierra Oil Pan Gasket #18-1237Normalized SKU: 181237UPC Code: 808282236922
-17% sale
Sierra Not Qualified for Free Shipping Sierra Cover and Gasket Assembly #18-0993
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Cover and Gasket Assembly #18-0993 $15.38 $18.35
Sierra 18-0993 Engine GasketsCover & Gasket Assy.OEM Interchange:OMC: 437228Sierra Cover & Gasket Assy. #18-0993Normalized SKU: 180993UPC Code: 808282227197
-16% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Elbow Gasket #18-0954
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Elbow Gasket #18-0954 $4.91 $5.78
Sierra 18-0954 Engine GasketsExhaust Elbow GasketOEM Interchange:MERCURY MARINE: 27-92720Sierra Exhaust Elbow Gasket #18-0954Normalized SKU: 180954UPC Code: 030999751980
Sold out -16% sale
Sierra Fuel Pump Gasket 2-pk #18-0889-9
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Fuel Pump Gasket 2-pk #18-0889-9 $5.03 $5.92
Sierra 18-0889-9 Engine Gaskets Details: Fits: MCM/MIE GM & Ford engines Fuel Pump Gasket (Priced Per Pkg of 2) Sierra Fuel Pump Gasket (Priced Per Pkg of 2) #18-0889-9 Normalized SKU: 1808899UPC Code: 808282161880
Sold out -17% sale
Sierra Not Qualified for Free Shipping Sierra Thermostat Gasket 2-pk #18-0875-9
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Thermostat Gasket 2-pk #18-0875-9 $9.78 $11.67
Sierra 18-0875-9 Engine GasketsThermostat Gasket (Priced Per Pkg of 2)Sierra Thermostat Gasket (Priced Per Pkg of 2) #18-0875-9Normalized SKU: 1808759UPC Code: 808282161804

Frequently Asked Questions

First Choice Marine is an online marine retailer carrying a diverse line of marine parts and accessories and related items from industry-respected and demanded manufacturers and suppliers. Through our diverse distributor network, we are able to access over 150,000 items, including our current site inventory, new products being added, and special order items. If you need it on your boat... we are your one-stop shop!

Yes, we offer FREE Shipping on most orders over $149 to US-48*.

Each product displays a shipping status message, just above the item price. Below is the meaning for each of these codes.

  • Qualifies for Free Shipping: This item qualifies for free shipping when the order is $149+
  • Qualifies for Free Ground Shipping: This item qualifies for free ground shipping when the order is $149+.
  • Oversized - Not Qualified for Free Shipping: This item is too large/heavy to qualify for free shipping
  • Hazardous Item - Not Qualified for Free Shipping: This item is hazardous and does not qualify for free shipping
  • Truck Freight - Not Qualified for Free Shipping: This item has to be shipped via truck freight. Please contact us for a quote
  • In-Store Pickup Only: This item can only be picked up in our Grain Valley, MO retail store

Below the price of the item, on the product page, there is a message indicating the availability of the product.

The quantity on hand is updated as inventory events happen and matches what we have available. If you have urgent needs and we are close to what you need, contact us, and we can confirm stock.

We offer a hassle-free return policy. If you're not completely satisfied with your purchase, you can return it within 30 days for a full refund or exchange.

If you need to return an item, please follow the guidelines here so we can process a prompt refund and assist you in finding the correct item.

Free Shipping

On most orders $149+ to the continental 48 US states.

Secure Shopping

Fast, secure checkout with a variety of payment methods.

Shop with confidence

25+ years serving the marine industry.

Support center

Need help? Contact us via live chat, phone, or email.

© 2026 First Choice Marine.