The Easifix extrusion is designed to represent the profile of a mortar joint where the hollow of two glass blocks meet. As illustrated, the extrusion is adhered to the blocks by two beads of silicone. Glass Block Technology only recommend the use of Dow corning 794, which is a neutral odour silicone that's elasticity expands and contracts at 50% of its own volume.

Easifix spacers are manufactured in 2 lengths : 2.4m - horizontal and 185mm - vertical.