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Toggle Switch + Sierra Biplex Triplex Outlet Cover Plates

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Vintage Combo Light Switch + Narrow Outlet Covers for Historic Home

These replacement combination wall plates fit the vintage Sierra receptacles that had two or three plugs on one side and a regular toggle switch on the other. The discontinued devices were produced by the defunct Sierra Electric of Los Angeles, CA, for older homes built in the mid to late twentieth century (1950s, 1960s, 1970s) and from the early 1900's by McDonald.


  • made in USA
  • 4-9/16" W x 4-1/2" H x 5/32" D metal replacement outlet cover
  • outlet opening is 1-1/16" W x 2-29/32" H with screws spaced 3.812" apart center to center
  • standard toggle switch opening, screws spaced 2-3/8" apart center to center
  • 2 matching 1/4" screws (outlet) plus two 1/2" screws (toggle)
  • long narrow side is not a Decora rocker cutout - historic style part from the 1960s and 1970s
  • similar plates produced by McDonald prior to Sierra
  • flip cover over to use large rectangular opening on either the right or the left

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