What Is a Jumper Valve?

When homeowners talk about “changing a tap washer”, the jumper valve is the part they mean: the little brass-and-rubber assembly inside a traditional spindle tap that most people picture as how all taps work. They don’t: it’s one of three common tap types.

Why It Matters

• It’s the classic repairable tap. Washers and jumper valves are cheap, and a worn one is the standard cause of a dripping traditional tap.
• The washer isn’t always the whole story: the brass seat the washer presses onto wears too. A new washer on a worn seat keeps dripping; reseating the tap fixes it properly.
• Not all taps have washers. Mixer taps blend hot and cold internally through a cartridge; ceramic disc taps use quarter-turn discs. Fitting washer-thinking to those taps is how DIY repairs go wrong.

The Three Tap Types at a Glance

1. Jumper-valve taps: traditional style, washers inside, the classic repair.
2. Ceramic disc taps: quarter- or half-turn, inbuilt valve, cartridge repairs.
3. Mixer taps: one lever blending hot and cold internally, brand-specific cartridges.

Common Mistakes or Misunderstandings

• “I changed the washer and it still drips.” Almost always a worn valve seat, which needs reseating with the right tool, not another washer.
• “My mixer needs a new washer.” Mixers don’t have washers; they need the correct cartridge for the brand.
• “Any washer will do.” Sizes and profiles differ; the wrong one seals badly and fails fast. Quality parts are half the repair.

When to Call a Plumber

A dripping tap that resists a washer change, taps that are stiff or squeal, or any leak you’d rather not chase through three hardware-store trips: it’s a fast professional fix, and it stops the water wastage on your bill.