How to measure silicone hose diameter

Our silicone hoses are sold by internal diameter (ID) not external diameter. We measure this internal diameter with measuring calipers from internal edge to internal edge.

measuring silicone hoses

In order to select the correct hose, measure the outer diameter (OD) of the pipe you want to connect it to. This will be the same as the Internal Diameter of the silicone hose. For example if the outer diameter of the pipe is 76mm then you need to choose a silicone hose with a 76mm internal diameter (ID).

Internal and Outer diamenter

Take a look at our silicone hose range here.

How often should hoses be replaced?

engine bay with hosesMost automakers and belt manufacturers recommend having your hoses replaced once every 4 years. Of course, this will vary with mileage – a car that’s heavily driven may need to have the hoses replaced much sooner.

How can you tell if your hoses need replacing?

There are several key things to look for to see if your hoses are coming to the end of their lifespan.

Look for:

  • Kinks
  • Stiff or brittle texture
  • Surface cracks
  • Bulges or bubbles

Inspect the hoses and note any kinks or obvious signs of wear. Squeeze the radiator hoses (when cool ONLY) and see how they feel. If hoses are soft and pliable, there is no need to replace them. However, if hoses feel stiff, crackly, or brittle, they will need to be replaced.

While squeezing the hoses, inspect the surface for small cracks. These can easily become big problems, as they’re the primary point for a “blown” hose.

You can also check where the hoses connect to the inlet or outlet pipe. Look for bulges or bubbles around the hose clamps, as this is a sign of impending failure.

Hoses can last a long time, but replacing them before they fail is always the better option. Once you have identified that the hoses need replacing then consider whether you want to opt for a straight rubber replacement which will likely need changing again in 4 years or click here to see what difference do silicone hoses make.

Do Silicone hoses stretch?

can hoses stretch

It has previously been suggested that if you buy a hose, which is the wrong size, you could put the hose in boiling water to stretch it. This will not work. You cannot stretch our silicone hoses. Our polyester reinforced silicone will NOT stretch between temperatures of -40C and 180C so water from a kettle will have no effect. If fact the whole point of silicone as a raw material is that it does not shrink, expand or crack at these temperatures.

Hoses are sold by internal diameter not external diameter. You need to choose the hose with the internal diameter matching the outdoor diameter of the pipe you are wishing to connect to.

It is imperative that you ensure you do not buy a hose which is too small. Even a few millimetres could result in shearing of the inner liner which can mean pieces of silicone make their way into your system.

It is also worth noting that buying a how which is too big will result over clamping which will damage the hose and create bulging for water or air to escape.

To check out our full range of silicone hose sizes click here.

Our Top Blogs in 2020

As we are nearing the end of 2020 we thought we would do a roundup of the blog posts which have been viewed the most this year.


16k Pageviews

In this blog from back in 2018 we answer some of the most common questions regarding silicone superiority and effects on performance. We even discuss applications that silicone may not be the best for. Read full blog here.


12k pageviews

We are not surprised that this blog made it into the top 3 this year its a a question we know gets asked often. Can you use silicone hoses for fuel hoses? Well this blog answers this question and provides the more suitable alternative hoses. Read full blog here 


9k pageviews

Tuning companies often talk about stage 1,2 and 3 mods. But what are these mods and what do they mean? This blog gives you the low down Read full blog here 


5k pageviews

Rain is something that we are very familiar with here in the UK. When possible, it’s best to avoid deep puddles, or at least drive slowly through them, to prevent water from splashing into the upper part of the vehicle. But, if you are unlucky enough to stall in water, this blog may give you an insight into what happened. Read full blog 


4k pageviews

A surge tank is an important part of any turbo’s fuel system as it stops your engine from starving of fuel. This blog goes over how a fuel surge tank works. Read full blog

Troubleshooting issues with your silicone hoses

Upgraded silicone hoses

Silicone hoses are supple, chemical-resistant, anti-conductors, and can withstand a wide range of temperature extremes and therefore really do a great job at replacing rubber hoses. Whilst they are durable and long-lasting, there are a few things which can fail and these are mostly down to user error or lack of maintenance so we thought we would run through some issues you could come across.

Clogged hoses

You do not want your silicone hoses to clog, solidify, or get damaged in their operation. It is therefore imperative that you select the correct diameter the wrong one can render your operation ineffective. Temperatures, velocity, and pressure all change throughout production, so it’s important to factor these variables and be certain that you are you using the right diameter of silicone hose for your application.


Although vibration is a normal part of production too much vibration can compromise the lifespan. Heavy vibration can shake loose silicone hoses from their clamps or cause them to become tangled and warped over time. If you think you are getting too much vibration then ensure that you’re inspecting it regularly for worn or loose bearings, rotating components and misalignments.

Hoses Degrading

Not all hoses are created equal. While silicone hoses have longevity they still succumb to wear and tear over their lifespan. It’s important that you choose a silicone hose that’s compatible with your industry’s requirements. There are industries that require a fluorocarbon-lined silicone hose to handle specific liquids such as oil and fuel or the food and beverage industry that needs food-grade silicone. If your hose is degrading consider whether it has been selected properly for the job it needs to do.

The 2030 diesel and petrol car ban – what does it mean for you?

diesel carThe sales of new petrol and diesel cars and vans will end in 2030 the Prime Minister Boris Johnson has said. It’s part of what he’s calling a “green industrial revolution” and he’s pledged to invest more than £2.8bn in electric vehicles. But what do these changes mean for motorists?

Does it mean I’ll have to scrap my petrol or diesel car by 2030? 

Put simply no. The ban is only on the sale of new petrol and diesel cars. The average life of a car before it’s scrapped in 13.9 years, so we’re going see petrol and diesel cars bought just before the 2030 deadline will be on the road until well into the mid-2040s. What it does mean is that numbers will dwindle as car makers won’t be investing in the technology over the next decade. Petrol and diesel fuel will still be available at filling stations, but again expect pumps to gradually be replaced with chargers.

What about my classic car, will I still be able to drive it?

Unfortunately the jury is still out on this one. Some classic car experts predict that the bottom may fall out of the mainstream classic market, with classics becoming gallery pieces. While others predict a boom as petrol heads who can no longer get their fix with a new car switch to classics. But what is likely is an increase in taxes on classic cars and potentially bans from urban areas.

What areas are currently in the Very High Tier

stop signOne of the restrictions in the very high tier areas is that you should try to avoid travelling into them other than for things like work, education or youth services, to meet caring responsibilities or if you are travelling through as part of a longer journey. We therefore wanted to inform drivers which areas of the Country are currently in the Local COVID alert level: very high.

At the time of writing this blog the areas in the very high tier were:

Liverpool City Region

  • Liverpool
  • Knowsley
  • Wirral
  • St Helens
  • Sefton
  • Halton


  • Blackburn with Darwen
  • Blackpool
  • Burnley
  • Chorley
  • Fylde
  • Hyndburn
  • Lancaster
  • Pendle
  • Preston
  • Ribble Valley
  • Rossendale
  • South Ribble
  • West Lancashire
  • Wyre

Greater Manchester

  • Manchester
  • Bolton
  • Bury
  • Stockport
  • Tameside
  • Trafford
  • Wigan
  • Salford
  • Rochdale
  • Oldham

South Yorkshire

  • Barnsley
  • Rotherham
  • Doncaster
  • Sheffield

Winter car preparations

winter carLast years blog on ‘Preparing your car for winter’ was very popular and therefore we wanted to update our key tips ready for the cold weather coming round again.

Here’s our guide to preparing for Winter driving

1. Breakdown cover

After the year that we have had one of the most important this going into this winter is ensuring you can get home if the worst was to happen and you breakdown. With it looking more likely that restrictions will still be in place over the winter it is no longer a given that all garages, hotels and other amenties would be open to you. Therefore investing in breakdown cover is a sensible option. Even during the national lockdown earlier in the year the Rescue & Recovery Industry was recognised as ‘Key Workers’ within a critical sector.

2. Get your Car Serviced before Winter

Cold causes problems for cars but up to half of the problems could have been prevented by a regular servicing. Save yourself the cost and inconvenience and if possible book your car in for a service now. In winter, lots of garages offer discounted or even free ‘winter car checks’ so take advantage of some of these which may be local to you.

3. Battery check

Lights, heaters and blowers suffer from almost double the use in winter. Checking your battery should always be priority. If your car is having trouble when starting, get the battery checked out as soon as possible.

4. Check those Tyres

Your vehicles tyres are important for both braking and steering. It is essential to keep them in good condition. Despite the legal minimum of a 1.6mm depth, we advise that you stick to a minimum of 3mm during winter. This just helps improve the grip of your car on ice and snow.

5. Give your Windscreen a check

Before winter, give your windscreen a thorough check for any cracks and chips. During winter, water can seep into these cracks, freeze and then cause expansion. Getting anything repaired before this can happen can save lots of money.

6. Breakdown Kit

In case of emergency, we advise carrying a breakdown kit in your car during winter. This kit should include some of these essentials if not all:

  • Torch
  • Blanket
  • Shovel
  • Hi-vis vest
  • Food and water
  • De-icer and scraper
  • Phone charger/Power bank

7. Prepare!

If you know you need to be somewhere at a specific time, plan your journey ahead. Check for any road closures or delays and allow plenty of time for your journey. Being in a rush when the weather is bad increases your chances of being in a road car accident – so be prepared!

Keeping public transport moving with Rail and Bus Hoses

rail hosesViper Performance flame-retardant hoses are designed for optimum reliability in the demanding environment of transport applications. Our LSLM hoses are made with a specialist grade silicone normally used in applications requiring flame-retardant properties. The material performs mechanically as our normal automotive grade silicone, however, in case of fire, it will take longer to ignite. When burning, only low smoke and low toxic fumes are emitted.

The construction of fire retardant hoses is always made to your bespoke specification. The Viper Performance sales team will work with you on your project should you require specific construction. The number of plies will vary depending on the working pressure, bore size, and required wall thickness. A galvanised spring steel wire helix can be added for high or low pressure applications, or where extra flexibility or movement is required.

Viper Performance will be able to provide tooling for any shape, metal inserts, or complete hose assemblies.

If you are interested in this service please contact us on

The Greatest Cars Ever Made

beetle carThe best thing about classic cars is that they are very different from today’s cars. There is no match for those classic vehicles whether it be the bodywork design or the engineering which went into solving particular mechanical challenges.

But there are a select few vehicles that surpass the rest in terms of performance, value, and bodywork. Although every historic vehicle enthusiast will have their own opinion of what makes a car great, here is a list (in no particular order) that we think are true greats.

Volkswagen Beetle (of the 1960s)

The Volkswagen Beetle became one of the most popular cars of the 1960s offering affordable transportation with a very distinct style. 21 million VW Beetles were sold before going out of production in 2003.

Lamborghini Miura

Turing from affordable everyday cars to a magnificent feat of engineering and design the Lamborghini Miura quickly became the world’s fastest production car after its release in 1966. The car’s sleek design with recessed headlamps is indeed a classic that many will remember from the opening scene of the original “Italian Job” movie released in 1969.

Jaguar E-Type

We can’t skip the Jaguar E-type when talking about the most instantly recognizable cars in the world.

Lamborghini Countach

When first released in the 1970s, Lamborghini Countach was a car like no other. Its wedge-shaped styling, gull-wing doors, cooling ducts, and so-called “periscopio” was just out of the world! This car that looked like something landed from another planet could easily reach nearly 200 mph.

Chevrolet Corvette C1

The C1 is the first generation of the Corvette sports car that became streel legal in 1953. Chevrolet Corvette proved that America, the land of huge sedans, can also manufacture a sports car as great as the Europeans.

Ferrari 250 GTO

Built between 1962 and 1964, the Ferrari 250 GTO is considered to be the greatest Ferrari of all time. The combination of the beautiful body and the legendary Colombo V12 engine made the car not only fast but elegant too.

McLaren F1

The McLaren F1 stands out as an exceptional achievement of design brilliance and excellent engineering. McLaren had made just racing cars until it went on sale in 1992. McLaren F1 was the first dedicated road car designed by the chief designer Gordon Murray.

Porsche 911 2.7RS

The Porsche 911 is praised on both racetracks and streets alike, instantly recognizable to many people. Car enthusiasts and collectors tend to consider the classic cars – those built before 1973 with a long bonnet – as being the most beautiful and elegant. It is one of the longest-standing sports cars ever built.