Silicone Straight Reducer Hose Coupler

£4.35 - £15.05 (Inc. VAT)
£3.62 - £12.54 (Ex. VAT)
*** International customers (incl. Channel Islands) will only pay the ex. VAT price, but customs charges may be payable to your country on import. Click here for more info.
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0.00 KGS

Note: Some types of coolant are not compatible with silicone hoses. Please click here to download our Important Fitting Notes before buying and fitting silicone hoses.

Our high quality universal silicone hoses come in a range of diameters and shapes to suit many applications, including straight couplers, reducing couplers, hump hoses and 45, 90, 135 and 180 degree elbows. These hoses can be combined with our range of universal aluminium pipes and are perfect for making your own custom pipe work for coolant, intercooler, turbo and intake systems.

These reducer hoses feature two different end diameters to connect pipes of different diameters. All sizes are 76mm length. Smaller sizes up to 48mm I.D. are constructed from 4 high grade silicone layers reinforced with 3 layers of tough polyester fabric with a total wall thickness of approx 4.5mm. Sizes 51mm I.D. and larger feature an extra layer of silicone and reinforcing fabric for a total thickness of approx 5.4mm.

The hoses are available with an optional pair of fully T304 Stainless Steel W4 Worm-Drive Hose Clamps.

To measure the diameter needed measure the OUTER diameter of the hard pipe(s) you will be connecting the hose to, not including any bead on the pipe. This measurement is the internal diameter of hose you need to order. Most sizes will stretch approx 1mm-2mm with good lubrication, so a 70mm hose will usually fit a 71mm or 72mm pipe for example. To lubricate the hose use washing up liquid/dish soap or a silicone-based lubricant, do not use oil-based lubricants including WD-40.

Large Hose I.D. (Y1) Length (X) Wall Thickness (Z) Operating Pressure Burst Pressure
Larger end I.D. up to 48mm 76mm total Length 4.5mm 3-ply reinforced >7bar >10bar
Larger end I.D. 51mm or higher 76mm total Length 5.4mm 4-ply reinforced >9bar >12bar


  • Fitment: Universal (measure your size requirements to check compatibility)
  • Operating Temperature range: -50°c to 180°c
  • Warranty: 3 Years (UK based)

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  • 5
    Silicone Straight reducer coupler

    Posted by Rob on 14th Aug 2023

    Sizes accurate, material perfect, exactly what I wanted.