Sold out -15% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7163
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Sierra Sierra O-Ring #18-7163 $3.15 $3.70
Sierra 18-7163 O-RingsSierra O-Ring #18-7163OEM Interchange:MERCURY MARINE: 25-33465Sierra O-Ring #18-7163Normalized SKU: 187163UPC Code: 030999321756
Sold out -15% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7162
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Sierra Sierra O-Ring #18-7162 $2.33 $2.74
Sierra 18-7162 O-RingsSierra O-Ring #18-7162OEM Interchange:MERCURY MARINE: 25-33145OMC: 302337VOLVO: 3852044Sierra O-Ring #18-7162Normalized SKU: 187162UPC Code: 030999321749
Sold out -15% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7165
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Sierra Sierra O-Ring #18-7165 $1.28 $1.50
Sierra 18-7165 O-RingsSierra O-Ring #18-7165OEM Interchange:MERCURY MARINE: 25-32509MERCURY MARINE: 25-45253OMC: 304174Sierra O-Ring #18-7165Normalized SKU: 187165UPC Code: 808282259723
-15% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7161
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Sierra Sierra O-Ring #18-7161 $0.60 $0.70
Sierra 18-7161 O-Rings I.D.: 3.250" or 82.6mm Width: 0.070" or 1.8mm Sold each OEM Interchange:MERCURY MARINE: 25-32546 Normalized SKU: 187161UPC Code: 808282259716
Sold out -15% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7158
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Sierra Sierra O-Ring #18-7158 $0.29 $0.34
Sierra 18-7158 O-RingsSierra O-Ring #18-7158OEM Interchange:MERCURY MARINE: 25-30613OMC: 310585OMC: 310967Sierra O-Ring #18-7158Normalized SKU: 187158UPC Code: 808282259693
Sold out -15% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7157
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Sierra Sierra O-Ring #18-7157 $4.25 $5.00
Sierra 18-7157 O-RingsSierra O-Ring #18-7157OEM Interchange:MERCURY MARINE: 25-29976Sierra O-Ring #18-7157Normalized SKU: 187157UPC Code: 808282259686
Sold out -16% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7156
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Sierra Sierra O-Ring #18-7156 $2.48 $2.92
Sierra 18-7156 O-RingsSierra O-Ring #18-7156OEM Interchange:MERCURY MARINE: 25-29439OMC: 309731Sierra O-Ring #18-7156Normalized SKU: 187156UPC Code: 030999321688
-15% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7159
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Sierra Sierra O-Ring #18-7159 $4.42 $5.20
Sierra 18-7159 O-RingsSierra O-Ring #18-7159OEM Interchange:MERCURY MARINE: 25-31534Sierra O-Ring #18-7159Normalized SKU: 187159UPC Code: 808282259709
Sold out -15% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7153
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Sierra Sierra O-Ring #18-7153 $2.18 $2.56
Sierra 18-7153 O-RingsSierra O-Ring #18-7153OEM Interchange:MERCURY MARINE: 25-21836OMC: 3852565OMC: 911851Sierra O-Ring #18-7153Normalized SKU: 187153UPC Code: 808282259679
Sold out -15% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7155
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Sierra Sierra O-Ring #18-7155 $2.35 $2.76
Sierra 18-7155 O-RingsSierra O-Ring #18-7155OEM Interchange:MERCURY MARINE: 25-26855OMC: 305270Sierra O-Ring #18-7155Normalized SKU: 187155UPC Code: 030999321671
Sold out -16% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7149
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Sierra Sierra O-Ring #18-7149 $1.39 $1.64
Sierra 18-7149 O-RingsSierra O-Ring #18-7149OEM Interchange:VOLVO: 955989Sierra O-Ring #18-7149Normalized SKU: 187149UPC Code: 030999321626
Sold out -16% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7151
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Sierra Sierra O-Ring #18-7151 $1.97 $2.32
Sierra 18-7151 O-RingsSierra O-Ring #18-7151OEM Interchange:MERCURY MARINE: 25-20081Sierra O-Ring #18-7151Normalized SKU: 187151UPC Code: 030999321640
Sold out -15% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7150
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Sierra Sierra O-Ring #18-7150 $2.33 $2.74
Sierra 18-7150 O-RingsSierra O-Ring #18-7150OEM Interchange:OMC: 303598OMC: 331380OMC: 334913Sierra O-Ring #18-7150Normalized SKU: 187150UPC Code: 808282259662
-15% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7152
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Sierra Sierra O-Ring #18-7152 $3.76 $4.42
Sierra 18-7152 O-RingsSierra O-Ring #18-7152OEM Interchange:MERCURY MARINE: 25-20863OMC: 307082Sierra O-Ring #18-7152Normalized SKU: 187152UPC Code: 030999321657
Sold out -16% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7145
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Sierra Sierra O-Ring #18-7145 $1.07 $1.26
Sierra 18-7145 O-RingsSierra O-Ring #18-7145OEM Interchange:MERCURY MARINE: 25-64068OMC: 333572Sierra O-Ring #18-7145Normalized SKU: 187145UPC Code: 808282259655
-16% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7146
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Sierra Sierra O-Ring #18-7146 $2.53 $2.98
Sierra 18-7146 O-RingsSierra O-Ring #18-7146OEM Interchange:MERCURY MARINE: 25-47632OMC: 554545Sierra O-Ring #18-7146Normalized SKU: 187146UPC Code: 030999321596
-16% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7143
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Sierra Sierra O-Ring #18-7143 $1.22 $1.44
Sierra 18-7143 O-RingsSierra O-Ring #18-7143OEM Interchange:MERCURY MARINE: 25-65936OMC: 322501OMC: 331188VOLVO: 3852169Sierra O-Ring #18-7143Normalized SKU: 187143UPC Code: 030999321565
Sold out -15% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7142
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Sierra Sierra O-Ring #18-7142 $3.13 $3.68
Sierra 18-7142 O-RingsSierra O-Ring #18-7142OEM Interchange:OMC: 322119Sierra O-Ring #18-7142Normalized SKU: 187142UPC Code: 030999321558
Sold out -15% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7141
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Sierra Sierra O-Ring #18-7141 $0.51 $0.60
Sierra 18-7141 O-RingsSierra O-Ring #18-7141OEM Interchange:OMC: 321117VOLVO: 3852165Sierra O-Ring #18-7141Normalized SKU: 187141UPC Code: 030999321541
Sold out -15% sale
Sierra Not Qualified for Free Shipping Sierra O-Ring #18-7144
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Sierra Sierra O-Ring #18-7144 $6.04 $7.10
Sierra 18-7144 O-RingsSierra O-Ring #18-7144OEM Interchange:OMC: 326849Sierra O-Ring #18-7144Normalized SKU: 187144UPC Code: 030999321572

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.

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25+ years serving the marine industry.

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