Based on this product's specifications, here are some alternatives and similar models
Thread adapter BIG 1/4 inch 20x15mm model 428286 — metal thread reducer
Summary description:
Thread adapter BIG model 428286 with 1/4 inch 20x15mm dimensions. Designed to connect components with differing thread sizes, this metal adapter provides a compact, durable connection solution for pneumatic, workshop or hobby applications. Use it to join tools, hoses or fittings that require conversion between 1/4" threads and 15mm connections, ensuring reliable mechanical coupling.