Removal of Drain Interceptor

antony lord • June 14, 2022

Drain Interceptors Bristol

There are various different names and types of drain interceptor / drain siphon.The most common types of Interceptor Trap are Winser trap, Kenon trap, Bristol trap, Buchan trap and Reverse Interceptor trap. They are all made from vitreous clay and are still available to purchase today.


An interceptor trap is probably is a crucial part of a drainage system and are most commonly found in properties pre 1940.Their main purpose was to prevent smells and gases from the main public sewer venting into properties, therefore it was thought preventing airborne infection. This is done by the water held in the trap which creates an airtight seal, but allows solids and liquids to flow through. They were also thought help to prevent rodent access from the main sewer, although they must be operational and intact with the rodding eye cap in place. Rats are good swimmers and can easily negotiate the bend or trap of an interceptor and travel through the water. But this was not known at the time.


Interceptors are prone to deterioration and damage though and ground settlement, roots or general abuse can cause them to fail. At this stage they are excavated and removed and a straight line pipe installed, as this is usually easier and quicker than replacing the whole trap.


Interceptor traps are usually found in the outlet of the last manhole chamber from a property prior to the main public sewer connection. There is a rodding eye that gives a straight line access to the sewer. This rodding eye must be capped or sealed otherwise the trap is effectively pointless, because the open pipe will allow odours and rats through. Originally the caps were flat round clay ‘lids’. These days plastic or metal caps and plugs can be installed as a replacement.


If you are having issues with your drain interceptor like reoccurring blocked drains then Flow Sure Drains can make an inspection and advise you accordingly


CALL 01179292755 0117 929 2755


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What Are Drain Interceptors — And Why Do They Matter in Bristol? If you own or manage a property in Bristol built before the 1950s, there’s a good chance you’ve got a Victorian drain interceptor buried beneath your feet. And if your toilet’s slow to flush, your kitchen gulley smells, or the manhole’s backing up — that interceptor might be the hidden cause. At Flow Sure Drains , we uncover, inspect, and solve problems caused by these outdated systems every week across Bristol and the South West. 🧱 What is a Drain Interceptor? A drain interceptor (also known as a 'buchan trap' ) is an old-fashioned U-bend-style fitting found in Victorian and early 20th-century drainage systems. It was originally designed to: Stop sewer gases from entering the home Create a water seal between your drains and the public sewer But over time, these traps have become liabilities : They trap debris and grease They’re hard to access and maintain They collapse or become blocked, causing upstream problems in your house 🧰 Signs Your Drain Interceptor is Failing You may not even know you have one until it causes trouble. Watch out for: Persistent foul smells near external drains Toilets gurgling or slow to drain Manhole overflowing, but pipes seem clear Water sitting at the base of manholes Flow Sure Drains uses HD CCTV cameras to locate and inspect old interceptors. In many cases, we find root ingress , blockages , or collapses that have gone undiagnosed for years. ⚙️ Should You Remove or Bypass a Drain Interceptor? In most cases — yes . Interceptors no longer serve a useful purpose in modern drainage networks. Wessex Water and Bristol City Council both permit — and in some cases recommend — their removal or bypass, provided: You use a licensed contractor The replacement connection maintains flow and compliance We can: Excavate and remove the old trap Install a straight-through connection Use no-dig repair (patch lining) where possible Handle Wessex Water permissions where needed "What is a Victorian drain interceptor?" “It’s an old-style U-bend in the main drain system, common in pre-1950s Bristol homes, and often causes blockages today.” "Should I remove my drain interceptor?" “In most cases yes — modern systems don’t need them, and they often cause problems.” "Who removes drain interceptors in Bristol?" “Flow Sure Drains — local drainage experts with no call-out fee, CCTV inspections, and full removal service.” 📍 Why Choose Flow Sure Drains? ✅ Based in Bristol — we know the quirks of local Victorian drainage ✅ No call-out fees ✅ CCTV and no-dig solutions ✅ Emergency response available 24/7 📞 0117 427 4565 🌐 www.drains-bristol.co.uk

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