Geberit 282.303.21.2 (Impuls 290) flush mechanism for concealed cistern, type “Impuls 290” by Geberit.

• Adjustable height: approximately 32-45 cm (or 31.2-45 cm in some specifications).
• Adjustable overflow pipe: approximately 17-27 cm. 
• Cistern perforation: Ø40 mm. 
• Activation force: ~18 N. 
• Flush volumes: for example “small” 3-4 l and “large” 6 or 9 l. 
• Suitable for drinking water — and possibly for grey/rainwater with pH 6.0-9.5 (if preceded by a filter) in some cases.
• Glossy chrome finish. 
• Compatible with flush valve type 280 or 250 (Twico 1) in some installations. 
• Replaces older codes such as 282.303.KD & 241.823.00.1.

Advantages

• The ability to adjust height and overflow pipe provides flexibility in installation within concealed systems.
• The dual flush contributes to water savings — selecting small or large flush depending on usage.
• Good compatibility with Geberit type concealed cisterns.
• High-quality construction by Geberit, with the possibility to replace/upgrade older models.

Things to consider / What to watch out for

• Ensure your cistern has the correct perforation (Ø 40 mm) and that the height and installation allow for height adjustment of 32-45 cm.
• Check if the flush valve you have or intend to install is compatible (type 280 or 250 as mentioned).
• Check if the flush plate/activation lever is suitably compatible with the mechanism.
• During installation or maintenance, a specialized plumber may be required, especially in concealed systems where access may be limited.