JKC
Installation & Care Guide

Jaguar Type Flush Valve Spindle (35mm)

Follow along and check off each step as you go — most customers finish in about 8 minutes.

~8 minutes
6 simple steps
No plumber tools required
Model JKC-1085
Step 0

Before You Start

Tap each item as you gather it — a couple of minutes of prep now saves a return later.

Tools You'll Need

What's In The Box

Verify before you start: Compare your old spindle's square drive head (7mm x 7mm), shaft length (76mm), threaded body diameter (Ø25mm), and total length (121mm) against these dimensions before ordering or fitting — this spindle is built for Jaguar-style full-turn flush valves.
Installation

Step-by-Step Fitting

Six simple steps to replace your flush valve spindle and restore smooth, leak-free full-turn operation.

Hands full? Have the steps read out loud instead.
0 of 6 steps complete

Nice work — all steps complete!

Your flush valve spindle is installed. Turn the handle a few times to confirm smooth, leak-free operation.

1. Turn Off the Water Supply
~1 min
Locate the isolation valve or main supply feeding the flush valve and shut it off fully before starting.
2. Remove the Old Handle/Knob
~1 min
Unscrew and lift off the existing flush valve handle or knob to expose the spindle beneath it.
3. Unscrew and Remove the Old Spindle
~2 min
Turn the base cap counter-clockwise to unscrew the worn spindle and its rubber seal from the valve body.
Take care: If the old spindle feels stiff or seized, don't force it — a few drops of penetrating oil and a gentle back-and-forth turn usually frees it without damaging the valve body.
4. Thread In the New JKC Spindle
~2 min
Thread the new spindle into the valve body by hand first, then snug it with a wrench until it seats evenly.
Take care: Hand-tighten first, then only snug — overtightening the base cap can crack or pinch the rubber bonnet seal.
5. Refit the Handle/Knob
~1 min
Reattach the flush valve handle or knob onto the square drive head and secure it as it was originally fitted.
6. Turn On Water & Test the Full-Turn Action
~1 min
Turn the water supply back on and operate the handle through a few full turns, checking for smooth rotation and no leaks around the base.
Take care: If you notice any dripping at the base, turn the water off again and check that the spindle and seal are seated evenly before retesting.
Points To Take Care Of

Do's & Don'ts

The most common fitting mistakes — and how to avoid them.

Do

  • Verify your old spindle's dimensions against ours before ordering
  • Turn off the water supply fully before starting
  • Hand-tighten first, then snug with a wrench — don't overtighten
  • Keep the old spindle until you've confirmed the new one fits and seals
  • Test the full-turn action before closing up the fitting

Don't

  • Don't force the spindle if it doesn't thread smoothly — check orientation
  • Don't overtighten the base cap — it can crack the rubber bonnet seal
  • Don't reuse the old rubber seal — always fit the new spindle's pre-fitted one
  • Don't skip verifying compatibility with Jaguar-style full-turn valves
  • Don't grip the brass body directly with pliers — protect it with a cloth to avoid scratching
Quick Reference

Troubleshooting

If something doesn't feel right after fitting, check here first.

SymptomLikely CauseWhat To Do
Water still dripping after installationBase cap not fully seated or seal misalignedTurn off water, remove and reseat the spindle so the rubber bonnet sits flush.
Handle feels stiff or won't turn smoothlyOvertightened base cap or debris in the valve bodyLoosen slightly and check for smooth full-turn rotation before retightening.
New spindle doesn't seem to fitDimension mismatch with your existing flush valveCompare your old spindle's square-head size, shaft length, and thread diameter to our listing, and contact support if unsure.
Small leak around the base after a few daysRubber bonnet seal settling in or a loose base capSnug the base cap slightly further; if the leak continues, contact support.

Still need a hand?

Message our support team with your order details and we'll help you sort it out.

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