The Geberit 244.510.00.1 (officially the Type 380AG) is a high-performance filling valve with a 3/8" side water supply connection. It is primarily designed for exposed (external)toilet cisterns, including ceramic and plastic models. 
Durable Connection: Equipped with a 3/8" BSP threaded nipple made of brass, which offers superior longevity compared to plastic alternatives.
Backflow Prevention: Features a Type AG "free outlet with overflow" to prevent contaminated water from siphoning back into the potable supply.
Adjustable Water Level: The filling height can be precisely adjusted by turning an integrated spindle.
Versatile Use: Suitable for potable water and filtered rainwater (pH 6.0–9.5).
Direct Replacement: This is the modern replacement for the discontinued part number 242.983.00.1.