Start by identifying what you’re connecting (hose-to-hose, hose-to-thread, or thread-to-thread). Then match the hose size/diameter and the thread type/size if there is one. If replacing a fitting, measuring the old one is often the quickest way to get a match.

They look similar but don’t always seal the same. In caravan plumbing, BSP-style threads are common. If you’re unsure, compare your existing fitting or use the same thread type as the part you’re replacing to avoid leaks or cross-threading.

Common causes are mismatched sizes, damaged threads, overtightening, or hoses not seated fully. Also check hose ends for splits and ensure clamps are the correct type and positioned behind the barb/ridge.

Some threaded connections need sealing (tape or a suitable sealant), while others seal via an O-ring or washer and shouldn’t be taped. If the fitting has an O-ring/washer, keep threads clean and don’t over-tighten.

Use clamps that suit the hose and the application—stainless clamps are a good choice for corrosion resistance. Make sure the clamp size range matches the hose, and avoid over-tightening which can damage hose or plastic fittings.

Confirm the connection type (threaded vs push-fit vs barb), hose size, and available space. For pump setups, check inlet/outlet sizes and ensure fittings are rated for pressurised water lines.

Many simple repairs (replacing clamps, hose ends, basic fittings) are DIY-friendly. Turn off the water supply/pump, relieve pressure, and test for leaks after installation. If you’re not confident, get help—small leaks can cause big damage over time.