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Type S Slide on

Type S Slide on

Sentinel type

The Sentinel Type Anodes slide onto a steel rod and then screw into a brass plug.


Brass Plug Part Number NPT Size Internal Thread Use with Element Part Number Plug NPT Size Inside Diameter Outside Diameter
SP-250 1/4" 10 24 S-438 S-438 1/4" OR 3/8" .1875" .4375"
SP-375 3/8" 10 24 S-438 S-500 1/2" .1875" .500"
SP-500 1/2" 10 24 S-500 S-813 3/4" .1875" .8125"
SP-750 3/4" 10 24 S-813 S-1000 1" .1875" 1.000"
SP-1000 1" 10 24 S-1000 S-1500 1-1/2" .375" 1.500"

Stainless steel rods for sentinel anode
Part Number Rod Size Use With
SR-3 3/16" x 3" S-438 - S-500
SR-6 3/16" x 6" S-813 - S-1000
  • S-813 Sentinel Zinc Disc Anode S-813 Sentinel Zinc Disc Anode

    S-813 Sentinel Zinc Disc Anode

    Rotometals.com

    $4.39
    Sentinel type slide onto a steel rod and then screw into a brass plug. Federal Stock Number: 5340-526-3656 Dimensions: 3/4" Plug NPT Size Brass Insert: .187in/4.8mm Diameter: .8125in/20.6mm Thickness: .500in   ELEMENT   Zn %...
    $4.39
  • S-500 Sentinel Zinc Disc Anode S-500 Sentinel Zinc Disc Anode

    S-500 Sentinel Zinc Disc Anode

    Rotometals.com

    $2.70
    Sentinel type slide onto a steel rod and then screw into a brass plug. Federal Stock Number: 5340-526-3664 Dimensions: 1/2" Plug NPT Size Brass Insert: .187in/4.8mm Diameter: .500in/12.7mm Thickness: .500in   ELEMENT   Zn %...
    $2.70
  • S-438 Sentinel Zinc Disc Anode S-438 Sentinel Zinc Disc Anode

    S-438 Sentinel Zinc Disc Anode

    Rotometals.com

    $2.56
    Sentinel type slide onto a steel rod and then screw into a brass plug. Federal Stock Number: 5340-526-3663 Dimensions: 1/4" or 3/8" Plug NPT Size Brass Insert: .187in/4.8mm Diameter: .4375in/11.1mm Thickness: ...
    $2.56