This is a Conduit Mount which serves as a multi-purpose attaachment.

Iron Ridge Knockout tile is the solution for your tile roof solar installations. Strong, durable and simple tiles to accomodate for any shape or size roof tile.

The elevated and encapsulated is the doc is why it is the only solar panel attachment to pass the TAS-100 Wind Driven Rain Test. Over 1,000 pounds of uplift capacity.