The concrete cylindrical plug is a straight, round insert made of waterproof C30/37 concrete, designed to close holes left by fibre-concrete spacer tubes and tie rods in reinforced concrete walls and foundations. The constant 22 mm diameter fits standard spacer tubes, while the two available lengths – 20 and 50 mm – allow you to choose the appropriate embedment depth depending on wall thickness and design requirements. The plug is bonded with a two-component adhesive, providing secure anchorage and watertightness up to 25 m water column, making it suitable for structures exposed to continuous or occasional water pressure. The use of C30/37 concrete ensures high compressive strength and resistance to mechanical damage, while the simple cylindrical geometry allows fast, repeatable installation without additional shaping or trimming.