Sea-Dog 426040-1
Compact brass cable outlet sized for RG58 coaxial cable, with a watertight seal when installed correctly.
Identify Sea-Dog Chrome-Brass Marine Coax Cable Outlets
A chrome marine cable outlet may have the same exterior finish as another size but be made for a different coaxial cable. Sea-Dog 426040-1, 426042-1 and 426051-1 serve RG58, RG8X and RG8U respectively. Use the old cable marking and gland dimensions to identify the outlet before disturbing the deck penetration.
Identify the original coaxial cable outlet
The table lists exact Sea-Dog part numbers and manufacturer specifications. On narrow screens, scroll the table sideways to see every column.
| MPN | Coaxial cable | Drawing A | Drawing B | Drawing C | Nut style |
|---|---|---|---|---|---|
| 426040-1 | RG58 | 1¼ in | ¼ in | ⅝ in | Knurled nut |
| 426042-1 | RG8X | 1¼ in | 5/16 in | ⅝ in | Knurled nut |
| 426051-1 | RG8U | 1½ in | ⅜ in | 11/16 in | Hex nut |
Match the cable before the outlet. The RG58, RG8X and RG8U versions are different sizes. A larger gland does not establish a reliable watertight fit around a smaller cable. Sea-Dog also specifies a hex nut on 426051-1, versus the knurled nuts on 426040-1 and 426042-1.
Material and installation: all three cable glands use chrome-plated cast brass and a compression-style seal. Their manufacturer A/B/C values are shown above. Sea-Dog lists three #6 flat-head fasteners per outlet, not supplied with the part. The sealing fit depends on using the designated cable and proper mounting.
See the manufacturer technical drawings: Sea-Dog cable-outlet sizes.
Inspect the removed part before replacement
- Read the coaxial cable marking first: RG58, RG8X or RG8U.
- Compare the old gland's manufacturer A, B and C dimensions against the chart; do not confuse the drawing dimensions with mounting screw spacing.
- Check the compression nut style, especially the hex nut on the largest 426051-1.
- Inspect the sealing surface for old sealant, corrosion or irregularities before installing a replacement.
- All three outlet bodies mount with three #6 flat-head fasteners; verify your existing hole pattern and seal.
Exact catalog part numbers
Select an exact UsedRVParts listing to check its condition and availability. Viewing and pickup in Kelowna are by appointment.
Sea-Dog 426042-1
Similar outside size to 426040-1 but with a larger nominal cable-passage dimension for RG8X.
Sea-Dog 426051-1
Larger outlet for RG8U coax, with a hex nut rather than the knurled nut on the smaller versions.
Related marine electrical references
A coaxial cable gland passes an antenna cable through a surface without providing an electrical outlet. For a separate DC connection, compare the Sea-Dog accessory power and USB outlet identification guide.
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