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MARTYR
Engine Cooling System “Pencil” Anodes

Protect your engine against galvanic corrosion by changing its anode regulary.

Anodes may be purchased as a complete assembly (anode with brass plug) or as a replacement anode only. Threads for replacement anodes (which screw into the plug) are “NPT.” Outside threads for plugs (which screw into the engine block) are “UNC”. “Length” refers to visible portion of anode when installed in plug. Offered in zinc alloy only.

Product Models
Description WM Model # MFG Part # Availability Price Quantity  
Anode with Plug, Length: 1 1/8", Diameter: 3/4", NPT: 3/8", UNC: 8mm (Fits Yanmar) 593501 CM272100200300Z
In stock online.

$4.99

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Anode with Plug, Length: 1 3/4" (45mm), Diameter: 3/8" (10mm), NPT: 1/4", UNC: 5/16" 332155 CME0
In stock online.

$6.99

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Anode with Plug, Length: 2" (51mm), Diameter: 1/4" (6mm), NPT: 1/8", UNC: 1/4" 519017 CME00
In stock online.

$6.99

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Anode with Plug, Length: 2" (45mm), Diameter: 1/2" (13mm), NPT: 3/8", UNC: 3/8" 194274 CME1
In stock online.

$10.49

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Anode with Plug, Length: 1 3/4" (45mm), Diameter: 1/2" (13mm), NPT: 3/8", UNC: 3/8" 6670848 CME1D
Ships from vendor

$15.99

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Anode with Plug, Length: 1 1/2" (38mm), Diameter: 1/2" (13mm), NPT: 3/8", UNC: 3/8" 6670855 CME1E
Ships when available.

$4.89

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Anode with Plug, Length: 1 1/4" (32mm), Diameter: 1/2" (13mm), NPT: 3/8", UNC: 3/8" 6670863 CME1F
In stock online.

$5.79

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Anode with Plug, Length: 1" (25mm), Diameter: 1/2" (13mm), NPT: 3/8", UNC: 3/8" 6670871 CME1G
In stock online.

$12.49

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Anode with Plug, Length: 2" (51mm), Diameter: 3/8" (10mm), NPT: 3/8", UNC: 7/16" 593485 CME1H
In stock online.

$10.99

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Anode with Plug, Length: 2" (51mm), Diameter: 5/8" (16mm), NPT: 1/2", UNC: 7/16" 194282 CME2
In stock online.

$10.99

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Anode with Plug, Length: 2" (51mm), Diameter: 3/4" (19mm), NPT: 3/4", UNC: 1/2" 485318 CME3
In stock online.

$12.99

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Anode with Plug, Length: 3 3/8" (86mm), Diameter: 3/4" (19mm), NPT: 3/4", UNC: 1/2" 485334 CME4
In stock online.

$12.99

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Anode with Plug, Length: 5 5/8" (92mm), Diameter: 3/4" (19mm), NPT: 3/4", UNC: 1/2" 217838 CME5
In stock online.

$12.99

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Anode Only, Length: 1 3/4" (45mm), Diameter: 3/8" (10mm), NPT: 1/4" 307314 CMEZ0
In stock online.

$2.99

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Anode Only, Length: 2" (51mm), Diameter: 1/4" (6mm), NPT: 1/8" 524611 CMEZ00
In stock online.

$2.99

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Anode Only, Length: 2" (45mm), Diameter: 1/2" (13mm), NPT: 3/8" 194290 CMEZ1
In stock online.

$3.99

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Anode Only, Length: 1 3/4" (45mm), Diameter: 1/2" (13mm), NPT: 3/8" 6670889 CMEZ1D
Ships from vendor

$1.89

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Anode Only, Length: 1 1/2" (38mm), Diameter: 1/2" (13mm), NPT: 3/8" 6670897 CMEZ1E
Ships when available.

$1.89

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Anode Only, Length: 1 1/4" (32mm), Diameter: 1/2" (13mm), NPT: 3/8" 6670905 CMEZ1F
Ships when available.

$1.79

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Anode Only, Length: 1" (25mm), Diameter: 1/2" (13mm), NPT: 3/8" 6670913 CMEZ1G
Ships when available.

$5.99

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Anode Only, Length: 2" (51mm), Diameter: 3/8" (10mm), NPT: 3/8" 4725826 CMEZ1H
Item no longer available.
Anode Only, Length: 2" (51mm), Diameter: 5/8" (16mm), NPT: 1/2" 194308 CMEZ2
In stock online.

$3.99

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Anode Only, Length: 2" (51mm), Diameter: 3/4" (19mm), NPT: 3/4" 485326 CMEZ3
Ships when available.

$3.99

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Anode Only, Length: 3 3/8" (86mm), Diameter: 3/4" (19mm), NPT: 3/4" 485342 CMEZ4
In stock online.

$3.99

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Anode Only, Length: 5 5/8" (92mm), Diameter: 3/4" (19mm), NPT: 3/4" 217820 CMEZ5
In stock online.

$4.59

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Protect your engine against galvanic corrosion by changing its anode regulary.

Anodes may be purchased as a complete assembly (anode with brass plug) or as a replacement anode only. Threads for replacement anodes (which screw into the plug) are “NPT.” Outside threads for plugs (which screw into the engine block) are “UNC”. “Length” refers to visible portion of anode when installed in plug. Offered in zinc alloy only.

Specs

REVIEW SNAPSHOT®

by PowerReviews
MartyrEngine Cooling System “Pencilx9D Anodes
 
4.9

(based on 16 reviews)

Ratings Distribution

  • 5 Stars

     

    (14)

  • 4 Stars

     

    (2)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Easy to use (10)
  • Protects well (8)

Cons

No Cons

Best Uses

  • Engine (15)
    • Reviewer Profile:
    • Advanced (9), Casual/ recreational (4)
    • Was this a gift?:
    • No (16)

Reviewed by 16 customers

Displaying reviews 1-10

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5.0

Fits M24XP engine with 3" heat exchanger

By Sergei

from Kemah, TX

About Me Casual/ Recreational

Verified Buyer

Pros

  • Easy to Use

Cons

    Best Uses

    • Engine

    Comments about Engine Cooling System “Pencilx9D Anodes:

    Still looks OK after 6 month.

    • Was this a gift?:
    • No
     
    5.0

    Perfect fit

    By Chuck

    from Great oak

    About Me Advanced

    Verified Buyer

    Pros

      Cons

      • Difficult to Use

      Best Uses

      • Engine

      Comments about Engine Cooling System “Pencilx9D Anodes:

      Nice fit

      • Was this a gift?:
      • No
       
      5.0

      So easy to do!

      By Kim

      from Gig Harbor, Washington

      About Me Beginner

      Verified Buyer

      Pros

      • Easy to Use

      Cons

        Best Uses

        • Engine

        Comments about Engine Cooling System “Pencilx9D Anodes:

        Really easy to replace. And saved money by only buying the anodes!

        • Was this a gift?:
        • No
         
        5.0

        Perfect fit. Exact replacement.

        By Mac

        from Boston

        About Me Professional

        Verified Buyer

        Pros

        • Easy to Use

        Cons

          Best Uses

          • Engine

          Comments about Engine Cooling System “Pencilx9D Anodes:

          Just what I was looking for.

          • Was this a gift?:
          • No
           
          5.0

          great zinc

          By nickademus

          from Vineyard haven

          About Me Professional

          Verified Buyer

          Pros

            Cons

              Best Uses

              • Engine

              Comments about Engine Cooling System “Pencilx9D Anodes:

              Great product

              • Was this a gift?:
              • No
               
              5.0

              good product

              By Tom

              from Cranston, RI

              About Me Casual/ Recreational

              Verified Buyer

              Pros

              • Protects Well

              Cons

                Best Uses

                • Engine

                Comments about Engine Cooling System “Pencilx9D Anodes:

                It's the right size Zn for my Universal Diesel 25XP engine heat exchanger.

                • Was this a gift?:
                • No
                 
                5.0

                Works as advertised

                By M & A Ent

                from So-Cal

                About Me Advanced

                Verified Buyer

                Pros

                • Protects Well

                Cons

                • Not Durable

                Best Uses

                • Engine

                Comments about Engine Cooling System “Pencilx9D Anodes:

                Trying to use a engine pencil Zink that screws into the old brass threaded base is a pipe dream & practically impossible as the mostly dissolved old Zink required drilling out to remove old one & it usually breaks off. So might as well get one that has the brass threaded base as part of it to begin with.

                • Was this a gift?:
                • No
                 
                5.0

                Zinc replacement is easy and inexpensive

                By S/V Papillon

                from La Porte, Texas

                About Me Advanced

                Verified Buyer

                Pros

                • Easy to Use
                • Less expensive than a plug with a zinc
                • Protects Well

                Cons

                  Best Uses

                  • Engine
                  • Heat Exchanger

                  Comments about Engine Cooling System “Pencilx9D Anodes:

                  When a plug with a zinc is expended I replace the zinc. The zinc is threaded into the plug and can be removed and a new one screwed in. Even if the old zinc is totally gone or breaks off, it can be drilled out and a tap of the appropriate size can be used to clean the threads. The new zinc can then be screwed into the plug.

                  • Was this a gift?:
                  • No
                   
                  5.0

                  zinc

                  By ragamuffin

                  from cape cod ma

                  About Me Advanced

                  Verified Buyer

                  Pros

                  • Easy to Use
                  • Protects Well

                  Cons

                    Best Uses

                    • Engine

                    Comments about Engine Cooling System “Pencilx9D Anodes:

                    they work great

                    • Was this a gift?:
                    • No
                     
                    5.0

                    Pleasantly surprised

                    By Capt Joe

                    from Savannah GA

                    About Me Advanced

                    Verified Buyer

                    Pros

                    • Easy to Use

                    Cons

                      Best Uses

                      • Engine

                      Comments about Engine Cooling System “Pencilx9D Anodes:

                      Was pleasantly surprised to find the pencil anode needed for my heat exchanger on the shelf.
                      Last year I paid over $2,000.00 to have my heat exchanger replaced due to the galvanic corrosion. For only a few dollars, it is now part of my routine maintenance.

                      • Was this a gift?:
                      • No

                      Displaying reviews 1-10

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