• Save up to 17% off Yamaha Outboard Covers • Save up to 20% off Mercury Outboard Covers • Save up to 19% off Suzuki Outboard Covers • Save 5% off Honda Outboard Covers • Save up to 30% off Yamaha Boat & WaveRunner Covers

Contact Our Parts Experts: 1-888-625-5460

B2B: 941-900-4810

Hablamos Español
Shop by Engine
Free Shipping over $99*
Earn up to 4.5% Back on Purchases
Assistance From Boat Parts Experts
Free Shipping over $99*
Earn up to 4.5% Back on Purchases
Assistance From Boat Parts Experts

Free Shipping over $99

Orders $99 or more ship free within the contiguous U.S.
May not apply to engines or oversized orders.

Shipping Policy

Free Shipping over $99

Orders $99 or more ship free within the contiguous U.S.
May not apply to engines or oversized orders.

Shipping Policy

PartsVu Blue Rewards

Earn up to 1.5 points for every $1 spent. That’s up to 4.5% back that you can redeem and save on future orders. Excludes engine & lower unit sales.

Start Saving Now

PartsVu Blue Rewards

Earn up to 1.5 points for every $1 spent. That’s up to 4.5% back that you can redeem and save on future orders. Excludes engine & lower unit sales.

Start Saving Now

Ready To Serve

Our top priority is your ultimate satisfaction, and to get you back to boating as soon as possible.

Contact a Parts Pro

Ready To Serve

Our top priority is your ultimate satisfaction, and to get you back to boating as soon as possible.

Contact a Parts Pro

Mercury - Check valve - 21-8582361
SKU: 21-8582361
$40.98 $48.49
This product could earn you points
Learn more about PartsVu rewards

Free Shipping Over $99


Orders $99 or more ship free within the contiguous U.S. May not apply to engines or oversized orders.

Learn More

Fast Shipping


In-stock orders ship the next day, from the warehouse closest to you.

Learn More

Quick & Easy Returns


We accept returns on most items for 45 days— with no restocking fees.

Learn More

Ready to Serve


Our top priority is your ultimate satisfaction, and to get you back to boating as soon as possible.

Contact a Parts Pro

Description
This product has been superseded by: 21-8582362

Check valve

Specs & Engine Application
  • Supersessions
    21-858236, 21-8582362, 21-8582362

Reviews

★★★★★
★★★★★
★★★★★
★★★★★

  • FREE SHIPPING

    on all orders over $99!

  • 45-DAY RETURNS

    so you can get the right parts

  • REWARDS ON EVERY PURCHASE

    earn up to 4.5% back

  • PREMIER CUSTOMER SERVICE

    throughout your buying journey
Mercury - Check valve - 21-8582361
Mercury

Mercury - Check valve - 21-8582361

$40.98 $48.49
This product has been superseded by: 21-8582362

Check valve
View product