Inspect the inlet hose to determine whether you have a standard solenoid valve, a mechanical aqua‑stop hose, or a complete electronic aqua‑stop assembly.

A basic valve is a single solenoid in one plastic housing with no outer sleeve.

A mechanical aqua‑stop has an outer hose and a red window that turns red if the inner hose bursts.

A complete aqua‑stop includes an external solenoid box and cannot be unscrewed at the machine end.

Buy a replacement that matches your original valve style to maintain safety certification.