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🔒 Secure locking design — Includes a built‑in barrel lock and two keys to prevent tampering with your fresh‑water tank. 💨 Vented for smooth filling — Integrated vent allows air to escape during filling, helping prevent backflow and splashing. 🚐 Ideal for motorhomes & caravans — Suitable for most onboard fresh‑water tank inlet housings used across UK leisure vehicles. ⚙️ Easy replacement fit — Typically fits standard 75mm water inlet assemblies (check your existing cap for compatibility).