Sea-Dog 420390-1
Brass two-position control. Fully pushed in is off; pulled out is on.
Sea-Dog Push-Pull, Horn Button & Momentary Switch Guide
Sea-Dog's marine push-pull controls include two-position on/off switches, a splash-protected alternative and a three-position cabin/running-light style. Two separate momentary push buttons serve hold-to-operate circuits such as horns. Compare the original control's operation, panel thickness and terminal connections before ordering.
Compare switch operation and mounting
Compare the exact manufacturer number rather than relying on front appearance. On narrow screens, scroll the chart sideways to see the complete specifications.
| MPN | Component | Switch action | Mounting dimensions | Panel allowance |
|---|---|---|---|---|
| 420390-1 | Two-position push-pull | Maintained on/off | A 1 in; B 3/8 in | 1 in max panel thickness |
| 420396-1 | Splash-guard push-pull | Maintained on/off | A 15/16 in; B 3/8 in | 7/8 in max panel thickness |
| 420410-1 | Three-position push-pull | Off / first / first plus second circuit | A 1 in; B 3/8 in | 1 in max panel thickness |
| 420415-1 | Red miniature horn button | Momentary SPST on/off | 1/2-in mounting hole | 5/16 in max panel thickness |
| 420420-1 | Brass push-button switch | Momentary SPST on/off | 5/8-in mounting hole | 1 in max panel thickness |
Maintained versus momentary: Sea-Dog 420390-1 and 420396-1 stay in their selected on/off position, while 420415-1 and 420420-1 return to off on release. The three-position 420410-1 has a different circuit operation. The PVC splash guard on 420396-1 is not designed for immersion.
Manufacturer diagram reference: The A and B measurements on the push-pull products are labelled dimensions in the original drawings. For the 420390 and 420410, Sea-Dog lists a maximum panel thickness of 1 inch; 420396 allows 7/8 inch. The momentary 420415 horn button allows 5/16 inch, while 420420 allows 1 inch.
For original specifications and installation guidance, see the manufacturer's references: Sea-Dog two-position push-pull, Sea-Dog pull/push wiring, Sea-Dog horn button, Sea-Dog brass push button.
What to check before ordering
- Read the old manufacturer number and determine if the actuator latches or springs back when released.
- Check the switch circuit. The three-position 420410-1 is not a standard two-position on/off replacement.
- Compare the original mounting depth and panel opening. The 420415-1 horn button needs a 1/2-inch hole; 420420-1 needs a 5/8-inch hole.
- Match the connection type: miniature horn buttons use quick-disconnect blades, while 420420-1 has two screw terminals.
- Disconnect electrical power and follow the original circuit's wiring diagram and load rating.
Find the matching Sea-Dog hardware
These product listings are for online ordering through NewRVParts. Goods ship from supplier warehouses; in-person viewing and pickup aren't available.
Sea-Dog 420396-1
A PVC-protected alternative to 420390-1 for light water exposure; not designed for immersion.
Sea-Dog 420410-1
First pull position powers the first circuit; second pull position also energizes the second circuit.
Sea-Dog 420415-1
Red nylon/phenolic horn button with 1/4-inch quick-disconnect terminals, returning off on release.
Sea-Dog 420420-1
Brass push-button switch with two screw terminals. The bare version does not specify a protective cap.
Related marine parts references
For more marine switch configurations, see the Sea-Dog maintained and momentary toggle comparison and the Contura and illuminated rocker guide. These references cover different contact arrangements, not guaranteed replacement fits.
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