Precast replacement surfaces for contact with heated metal

A precast refractory piece, comprising:

• a first surface,
• a second surface, disposed opposite the first surface,
• an engagement channel, extending through the precast refractory piece from the first surface to the second surface,
• an adjustable engagement device in communication with the second surface and with the engagement channel,
• a rod disposed in the engagement channel,
• a holding pin channel extending through the refractory piece from the first surface to the second surface,
• a holding pin inserted in the holding pin channel, wherein the holding pin is oriented to protrude from the second surface of the precast refractory piece,
• wherein the adjustable engagement device is configured to adjustably engage the rod in a fixed position in the engagement channel;
• wherein the rod comprises a threaded lateral surface, and
• wherein the adjustable engagement device is engaged to the rod in a threaded manner,
• wherein the precast refractory piece comprises a lateral surface;
• wherein a form wall having an interior surface and an exterior surface is attached to the lateral surface of the piece;
• wherein the form wall partially encloses, in cooperation with the second surface of the piece, an interface volume;
• wherein the form wall comprises a pumping port extending from the interior surface of the form wall to the exterior surface of the form wall, and
• wherein the form wall further comprises a breather hole extending from the interior surface of the form wall to the exterior surface of the form wall, and wherein the breather hole is located adjacent to the second surface of the precast refractory piece.