Doorking 1875-010 By-pass Board Note: Board has been redesigned by Doorking connections and function is same new board is smaller.
Doorking Bypass This is the bypass board for use with Doorking 1812 phones to bypass the system and allow the house phones to work if there is a problem with the wiring or system.
**This part can also be used for discontinued Linear 217908-01
![Sentex Bypass Board Sentex Crown Jewell [1875-010]](https://cdn11.bigcommerce.com/s-32eq2wsbti/images/stencil/500x659/products/10950/227762/sentex-bypass-board-sentex-crown-jewell-1875-010-sn1600341-k__52508.1721408098.jpg?c=2 "Sentex Bypass Board Sentex Crown Jewell [1875-010]")