Based on this product's specifications, here are some alternatives and similar models
Thread adapter BIG 3/8" to 1/4" model 428277
Summary description:
Thread adapter BIG model 428277 converts a 3/8" threaded connection to a 1/4" threaded connection. Manufactured by BIG, this adapter allows compatibility between tools, hoses or fittings with differing thread sizes. Suitable for workshop, pneumatic and hydraulic setups where a secure, standard-thread transition is required. Compact metal design for straightforward installation.