My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-70939 Exhaust Manifold Molded Hose for MerCruiser Stern Drive

Manufacturer

Picture for manufacturer Sierra

Part Number

118-70939
7 reviews
Sale Price

$32.62

3 left at this price

delivery box

Usually delivered within 2 days

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-70939 is a premium replacement exhaust manifold molded hose designed specifically for connecting the thermostat housing to the starboard exhaust manifold on MerCruiser stern drive engines. This precision-molded cooling system hose ensures proper water flow and optimal engine cooling performance.

Key Features:

  • EPDM rubber tubing with synthetic knit reinforcement for durability
  • Precision molded design provides full water flow through bends
  • Easy installation with exact OEM fit and specifications
  • Suitable for fresh water or raw water cooling systems
  • Built to meet or exceed original equipment manufacturer standards

Application:

  • Fits MerCruiser/MIE GM V-6 and V-8 engines (305 and 350 CID)
  • Replaces OEM part number: 32-8066361
  • Interchangeable with Mallory 9-44060

Sierra molded hoses are engineered for the demanding marine environment, delivering reliable performance and long service life for your boat's cooling system.

On time

easy ordering

Exceeded my expectations!

Fast shipping!

y

perfect store ever i shop

Made this order easy and fast

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy