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San Marco Siena Pull-Out 3891R O Ring / Spout Seal Kit

SKU: 3891RMAR
Genuine San Marco Siena Pull-Out 3891R O Ring / Spout Seal Kit. Required if the tap is dripping from the base of the spout.
£12.00
Free UK Delivery
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San Marco Siena Pull-Out 3891R O Ring / Spout Seal Kit

Tap Spares UK's 3891R spout seal kit contains everything you need to stop your San Marco Sienna Pull Out Tap from dripping and/or leaking from the bottom of the spout, where it meets the body of the tap.  

Kit contains:

  • 3 x black rubber rings
  • 2 x white plastic ring
  • 1 x grub screw

Genuine Tap Spare Part

O-Ring Replacement Guide

Step 1 – Remove the Tap Spout

Before starting, turn off the water supply. Remove the tap spout. Depending on your tap model, the spout will usually be held in place by either:

  • A small grub screw located at the back of the spout, or
  • A locking nut at the end of the spout.

Once removed, clean the spout thoroughly and remove any old grease, dirt, or debris before fitting the new O-Rings.

Step 2 – Replace the O-Rings

In most cases, you will only need to replace the black rubber O-Rings. The white O-Ring rarely needs replacing unless it is cracked, broken, or showing signs of damage.

Apply a small amount of plumber’s grease or washing-up liquid to help the O-Rings slide into place without stretching or damage.  Do not use Vaseline, as it can cause the rubber to deteriorate over time.

Step 3 – Refit and Check

Once the new O-Rings are fitted, carefully refit the spout, tighten everything back into place, and check that the tap operates smoothly with no leaks.

Important Information

If your tap spout has pinholes, corrosion, or visible damage, replacing the O-Ring kit will not solve the problem.

We strongly recommend checking your spout carefully before ordering a replacement kit to make sure the spout itself is still in good condition.

Videos & Frequently Asked Questions

DIY Repair Guides

Explore our collection of DIY Repair Guides covering common tap repairs, maintenance tips, troubleshooting advice, and step-by-step guides to help you fix everyday tap problems.

Why Buy from TapSparesUK

For over 40 years, TapSpares UK has been designing and manufacturing quality kitchen taps and replacement tap parts. As one of the UK's leading specialists in replacement valves, cartridges, bushes and tap spares, we help homeowners, plumbers and installers repair leaking and dripping taps quickly and cost-effectively. Our parts are manufactured using premium brass and ceramic components for long-lasting performance, helping you save money while reducing waste.

  • Over 40 years of industry expertise.
  • 12-month guarantee on all parts.
  • Premium brass and ceramic construction.
  • Vernier adaptors included where required.
  • Fast, free UK delivery direct from our factory.
  • Trusted by plumbers, installers and homeowners nationwide.
  • Installation guides available for many products.
  • Friendly UK technical support before and after your purchase.

We stock replacement parts for many leading kitchen tap brands, including Perrin & Rowe, Franke, Abode, John Lewis, Howdens, Wren, CDA, Bristan, San Marco and Carron Phoenix.

Not sure which tap spare part you need? Send images of your tap and/or valve via our Identify my tap form.