Based on this product's specifications, here are some alternatives and similar models
Flow sensor Panasonic BE-A301P, operating voltage 5–24 V DC, dimensions 20×15.5×16.5 mm
Summary description:
Panasonic BE-A301P is a compact flow sensor designed for inline fluid monitoring with an operating voltage range of 5–24 V DC and physical dimensions of 20 × 15.5 × 16.5 mm. The unit provides a space-saving solution for detecting flow in small systems, instrumentation, or OEM assemblies. Typical uses include monitoring liquid flow in control panels, lab equipment, or automated machinery where low-voltage operation and a small footprint are required.