From reference Astrvodokanal MUE:

The slide gate of stainless steel with the dimensions of 2330*2200 mm was installed on the distribution bowl of primary clarifiers of the Northern sewage treatment facilities in May 2009. For the time of operation, the personnel has noticed such features as ease of installation, ease of the manual operation, resistance of the material of the gate to corrosion, compaction equipment  ensuring the leak-free shutoff of the channel, ease of maintenance and operational reliability.