Stoney Racing GSI-0001 Silicone Coolant Hose Kit – Vauxhall Astra MK4 GSi / SRi 2.0 Turbo Z20LET

The Stoney Racing GSI-0001 is a full silicone replacement for the engine bay coolant hoses on the Vauxhall Astra MK4 GSi and SRi 2.0 Turbo Z20LET.

The kit replaces all 13 coolant hoses, including the turbo water hose with banjo fitting that most kits leave out. Each hose is built from 4-ply silicone with 3-ply polyester reinforcement, so it will not perish, swell or crack like ageing rubber hoses.

It is available in 3 colours and can be ordered with a full set of stainless worm-drive, spring or stainless T-bolt clamps, or without clamps if you plan to reuse your originals.

Key Features

• Direct-fit replacement for 13 coolant hoses
• Includes the turbo coolant hose with banjo fitting
• Fits Astra MK4 GSi and SRi with the Z20LET engine
• Manual, RHD only
• 4-ply silicone with 3-ply polyester reinforcement
• Working pressure over 7 bar, burst pressure over 10 bar
• Temperature range −50°C to 180°C
• Choice of 3 colours
• Optional full clamp kit in 3 styles
• 3-year manufacturer warranty

Specifications

Hoses Included

• Top radiator hose
• Bottom radiator hose
• Heater matrix inlet hose
• Heater matrix outlet hose
• Expansion tank lower hose
• Additional water pump hose
• Expansion tank top hose 1
• Expansion tank top hose 2 to metal pipe
• Expansion tank metal pipe to thermostat hose
• Throttle body coolant hose
• Oil cooler hose 1
• Oil cooler hose 2
• Turbo coolant hose with banjo fitting

Clamp Options

Black Spring Clips are the type most manufacturers use. They give the most even clamping pressure and are generally the best choice for coolant hoses, although being mild steel they can show surface rust over time.

Stainless Worm-Drive clamps are fully stainless, so they will not rust, and they are easier to fit in tight spaces. A good choice if engine bay appearance matters.

Stainless T-Bolt clamps are the heaviest-duty option, ideal where maximum clamping force is wanted.

None lets you reuse your existing clamps. These hoses are slightly thicker than standard, so some original clamps may be too small.

Important Fitting Information

• Some coolants are not compatible with silicone hoses. Check your coolant before fitting.
• Manual, right-hand-drive Z20LET models only.
• Use washing-up liquid to lubricate the hoses when fitting. Never use WD40 or any oil-based lubricant.
• Always dilute coolant with de-ionised water, never tap water, and never mix coolant types.

What's in the Box?

• 13 × Stoney Racing reinforced silicone hoses in your chosen colour
• Full clamp set in your chosen style (if selected)

Frequently Asked Questions

Does it include the turbo coolant hose?

Yes. The turbo water hose with banjo fitting is included, which most kits leave out.

Can I reuse my original clamps?

Often, yes. However, these hoses are slightly thicker than the originals, so some factory clamps may be too small.

Why are some colours on pre-order?

Stoney Racing makes some colour and clamp combinations to order. These are marked as pre-order and dispatched in around 3–6 weeks.

Which clamps should I choose?

Spring clips give the most even clamping force for coolant hoses. Stainless worm-drive clamps will not rust and are easier to fit. T-bolt clamps are the strongest option.

Is my coolant compatible?

Most are, but some coolants (particularly some OAT types containing 2-EHA) can damage silicone. Read the Important Fitting Notes linked on this page, which list compatible coolants.

What warranty do I get?

Stoney Racing silicone hoses carry a 3-year warranty.