45 Degree Reducing Silicone Elbow Hose

150mm Leg 300mm Long 3 & 4 Ply

SFR016013K-ASH

£6.58

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HolmeBank Business Park, Station Road
Unit 5
Mirfield WF14 8NA
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Silicone 45° Reducing Elbow is a high-performance connector designed to join pipes of different diameters while providing a smooth 45-degree bend for efficient routing. Manufactured with a smooth extruded silicone compound inner layer, reinforced by strong polyester braids, and finished with a high-quality silicone outer layer, this hose delivers excellent flexibility, durability, and resistance to heat and pressure. The reducing elbow design enables transitions between different bore sizes without compromising flow, making it ideal for cooling, air, and fluid systems. Built to SAE J20 R3 standards, this multi-ply hose operates reliably between -50°C and +250°C, ensuring dependable service across a wide range of demanding automotive, marine, and industrial applications.

Key Features:

Inner Layer: Smooth extruded silicone compound for efficient fluid and air transfer.
Reinforcement: Polyester braids for stability and pressure resistance.
Outer Layer: High-quality silicone for heat, ozone, and abrasion resistance.
Construction: 3–4 ply with 150 mm leg length for secure fitment.
Operating Temperature: -50°C to +250°C (peak +250°C).
Internal Diameter Range: 6.5 mm to 127 mm.
Working Pressure: From 12.33 bar (small bore) down to 1.9 bar (large bore).
Bursting Pressure: Typically 3x working pressure (up to 37 bar).
Bend Angle: 45° with reducing bore transition.
Standard: SAE J20 R3 compliant.

The silicone reducing elbow is designed to handle both size transitions and angled routing in confined or complex system layouts. Its multi-ply polyester reinforcement provides excellent strength and dimensional stability, while the silicone layers resist thermal degradation, cracking, and ozone damage. With working pressures up to 12.33 bar for smaller bores and burst ratings up to three times higher, the elbow ensures a strong safety margin across diverse applications. The smooth bore design minimises turbulence, supporting efficient fluid and air transfer, while the reinforced wall construction offers durability under vibration and thermal cycling. This makes the hose an excellent solution for installations requiring both reduction and angled connections.

Applications include automotive coolant and intercooler systems, turbocharger pipework, air intake connections, marine cooling lines, agricultural engines, and industrial fluid transfer where bore transitions are required. Widely used in performance upgrades, custom fabrication, and heavy-duty maintenance, silicone 45° reducing elbows provide durability, reliability, and flexible installation. Keywords: silicone 45-degree reducing elbow, reinforced silicone reducer bend, high-temperature silicone hose reducer, SAE J20 R3 compliant elbow, industrial reducing connector, silicone reducer elbow hose.

Specifications

Type: 45 Degree Elbow Reducer
Colour: Black
Standard: SAEJ20R3

Size Guide

Inside Diametermm	Outside Diametermm	Wall Thicknessmm	Working Pressurebar	Bursting Pressurebar	Bending Radiusmm	Number Of Ply	Each Leg Lengthmm
6.5	15.5	4.5	12.33	37	16	3	150
8	17	4.5	11.67	35	16	3	150
9.5	18.5	4.5	11.67	35	16	3	150
11	20	4.5	9	30	16	3	150
13	22	4.5	8.33	27	16	3	150
16	25	4.5	7.17	25	18	3	150
19	28	4.5	6.5	19.5	18	3	150
22	31	4.5	5.8	17.4	20	3	150
25	34	4.5	5.5	16	30	3	150
28	37	4.5	5.33	16	30	3	150
30	39	4.5	5.33	16	30	3	150
32	41	4.5	5.17	15.5	32	3	150
35	44	4.5	5	15	35	3	150
38	47	4.5	5	15	35	3	150
40	49	4.5	4.83	14.5	35	3	150
45	54	4.5	4.67	14	40	3	150
48	57	4.5	4.5	13.5	45	3	150
51	62	5.5	4.5	13.5	51	4	150
54	65	5.5	4.33	13	60	4	150
57	68	5.5	4.33	13	60	4	150
60	71	5.5	4.17	12.5	60	4	150
63	74	5.5	4	12	63	4	150
65	76	5.5	3.85	11.5	65	4	150
68	79	5.5	3.6	11	65	4	150
70	81	5.5	3.5	10.5	65	4	150
76	87	5.5	3.5	10.5	65	4	150
80	91	5.5	3.33	10	70	4	127
83	94	5.5	3.17	9.5	70	4	150
90	101	5.5	3	9	70	4	150
102	113	5.5	2.8	8.5	70	4	150
111	122	5.5	2.5	7.5	85	4	150
114	125	5.5	2.2	6.6	92	4	150
127	138	5.5	1.9	5.7	98	4	150

Measurements are nominal and may vary slightly.

How to measure ID

Measure the pipe, not the old hose

Heat and age make a used hose swell and go out of round. Take your reading across the metal outlet the hose slides onto — that measurement is your ID.

Use vernier calipers

Set the outer jaws across the widest point of the pipe. A tape measure round a curve reads low by a millimetre or two — enough to buy the wrong size.

Take three readings, keep the largest

Rotate 60° between each. If they disagree the pipe is oval; size to the biggest figure so the hose still seals.

Round to the nearest listed bore

Silicone stretches slightly. If you land between sizes, go down to the smaller bore for a tight seal — never up.

Order by ID, always. Every hose on this site is listed by internal diameter. OD is given for clearance only — it changes with wall thickness and ply count, so it is never the ordering size. On reducers, quote both ends, largest first.

Construction

1 · Outer cover

High-quality silicone

Heat, ozone, and abrasion resistance

2 · Reinforcement

Polyester braids

Stability and pressure resistance · From 12.33 bar (small bore) down to 1.9 bar (large bore) · Typically 3x working pressure (up to 37 bar)

3 · Inner liner

Smooth extruded silicone compound

Efficient fluid and air transfer · -50°C to +250°C (peak +250°C)

Conforms to SAE J20 R3.

33 bore sizes6.5mm to 127mm internal diameter

37 bar burst12.33 bar working on the smallest bore

SAE J20 R3 built to standardthe automotive coolant hose standard

3–4 ply reinforcementstepped up on the larger bores

Auto Silicone Hoses

45 Degree Reducing Silicone Elbow Hose

150mm Leg 300mm Long 3 & 4 Ply

Find your perfect colour

The colour goes right through the silicone compound rather than sitting on top as a coating, so it will not fade, peel or discolour in service. Built to SAE J20 R3 in all three.

Black

45 Degree Reducing Silicone Elbow Hose – Red

Red

Blue

Colours shown are indicative — screen rendering varies.

Joins anything. Leaks nothing.

The silicone connector range, made to the same standard as the hose it joins.

INTERNAL DIAMETERS

6.5mm to 127mm

RATED

−50°C to +250°C

WORKING PRESSURE

Up to 12.3 bar

REINFORCEMENT

3 and 4 ply braid

BUILT TO

SAE J20 R3

Product gallery

Frequently Asked Questions.

Answers to the questions we’re asked most about sizing, fitment and performance.

Still can't find your answer?

What size do I order?

Order by internal diameter, matched to the outside diameter of the metal pipe or stub the elbow slides onto. Measure the pipe itself with vernier callipers, not the hose you are replacing - hose stretches in service and reads a size large. Available in internal diameters from 16mm To 13mm to 127mm To 90mm, in black, red and blue.

How long are the legs?

150mm on each side, giving 300mm total length. That leaves plenty of material to trim back to the length you need. If you cut them down, leave at least 25-30mm of straight leg beyond the bend so the clip seats on a supported section - never let a clip end up sitting on the curve, because it will not seal evenly there.

What temperature and pressure will it take?

Continuous service from -50C to +250C, built to SAE J20 R3. Working pressure runs from 12.33 bar on the smallest bore down to 1.9 bar on the largest, with burst pressure from 37 bar down to 5.7 bar across the 6.5mm to 127mm range. For context, a car cooling system typically runs at 1 to 1.5 bar and well under 120C, so there is a substantial margin.

How is it constructed, and how many plies?

A smooth extruded silicone compound inner layer, polyester braid reinforcement, and a durable silicone outer layer that resists heat, ozone and abrasion. Smaller bores are 3 ply and larger bores step up to 4 ply - each size is built with the reinforcement it needs, so you do not have to specify it. Wall thickness runs from 4.5mm to 5.5mm depending on bore.

Can I use it for fuel or oil?

No. This is standard silicone, which is excellent with coolant, water and air but swells and breaks down in contact with petrol, diesel or oil - and that includes breather and catch-can lines, which carry oil mist. For anything with hydrocarbons in it, use our Fuel & Oil range, which has a fluorosilicone liner built to SAE J30 R6.

What is the bend radius?

Bend radius runs from 16mm on the smallest bore to 98mm on the largest. That is the radius the elbow is moulded to, so the bore stays fully round through the bend and flow is not restricted - which is exactly why a moulded elbow beats bending a straight hose round the same corner.