12mm ID Rubber Drain Down Hose

12mm ID TPU -20°C to +100°C

DDH012-ASH#1

£3.15

Delivery/Collection

Collect from Silicone Hose UK

Orders can be collected once you receive your ready-to-collect email.

Address

Silicone Hose UK

HolmeBank Business Park, Station Road
Unit 5
Mirfield WF14 8NA
United Kingdom

Get Directions

Opening hours

Monday	07:00 – 19:00
Tuesday	07:00 – 19:00
Wednesday	07:00 – 18:00
Thursday	07:00 – 18:00
Friday	07:00 – 17:00
Saturday	07:00 – 13:00
Sunday	Closed

Bank holidays may affect our opening hours and delivery times.

Returns

It's OK to change your mind
Return within 30 days for a full refund*. Learn More

Shop safely

Secure your shopping experience with various safe and trusted payment methods.

Shop safely with us

Rubber Drain Down Hose is a flexible, lightweight hose designed for hot water discharge and drain down applications in plumbing, heating, and maintenance environments. Manufactured by HosesUK from thermoplastic polyurethane (TPU) for both the inner and outer wall, the hose combines strength with flexibility and remains stable under frequent handling. With no reinforcement, it retains excellent manoeuvrability for temporary installations while maintaining a smooth bore for efficient water flow. Operating between -20°C and +100°C, the drain down hose delivers consistent reliability for hot water discharge, system flushing, and maintenance use. Available in Green and Orange.

Key Features:

Material: Thermoplastic polyurethane (TPU) inner and outer wall.
Internal Diameter: 12 mm.
Outside Diameter: 19 mm.
Wall Thickness: 3.5 mm.
Working Pressure: 5 bar.
Burst Pressure: 15 bar minimum.
Bending Radius: 36 mm.
Operating Temperature: -20°C to +100°C.
Colour: Green, Orange

The Rubber Drain Down Hose provides practical handling benefits thanks to its flexible TPU construction, making it easy to coil, transport, and connect for short-term or portable water discharge tasks. Its smooth bore supports efficient hot water flow without restriction, while its wall thickness ensures stability at pressures up to 5 bar with a 3:1 safety factor to burst. With an operating limit up to +100°C, the hose is suitable for hot water discharge and system drain down in plumbing and heating maintenance applications. The compact bending radius of 36 mm further improves usability, allowing the hose to be manoeuvred in tight spaces without kinking.

Applications include boiler and heating system drain down, hot water discharge, system flushing, and general maintenance duties. Distributed under the HosesUK brand, the Rubber Drain Down Hose provides a reliable, lightweight, and easy-to-handle solution for professionals requiring a portable hose for controlled water discharge in plumbing and facility service operations.

Size Guide

Inside Diametermm	Outside Diametermm	Wall Thicknessmm	Working Pressurebar	Bursting Pressurebar	Bending Radiusmm	Coil Weightkg	Coil Lengthm
12	19	3.5	5	15	36	17	100

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

Never go up: a bore wider than the fitting will not grip, whatever the hose is made of. If you land between listed sizes take the smaller bore, and secure it with a clip.

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

Material

Thermoplastic polyurethane (TPU) inner and outer wall

-20°C to +100°C · 5 bar · 15 bar minimum

Hoses UK

12mm ID Rubber Drain Down Hose

12mm ID TPU -20°C to +100°C

Find your perfect colour

The 12mm ID Rubber Drain Down Hose is the same part in both colours — only the colour changes.

Green

Orange

Colours shown are indicative — screen rendering varies.

Drain it down. Twelve mil.

TPU-lined drain hose, cut to the length you need.

INTERNAL DIAMETERS

12mm

RATED

−20°C to +100°C

WORKING PRESSURE

5 bar across all sizes

MATERIAL

TPU

SOLD BY

The metre

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 is it used for?

Draining down and flushing heating and plumbing systems, and hot water discharge generally. It is light and very manoeuvrable, which is what you want for a hose that gets dragged out, used and coiled up again.

What size and length do I order?

12mm internal diameter, 19mm outside diameter, with a 3.5mm wall. Order by the metre from 1 to 30 metres, or take the 100 metre full coil.

What is it made from?

Thermoplastic polyurethane (TPU), inner and outer wall, manufactured by HosesUK. TPU gives strength with genuine flexibility and stands up to repeated handling far better than a cheap PVC drain hose.

What is it rated for?

5 bar working pressure, 15 bar burst, -20C to +100C, with a 36mm minimum bend radius. The +100C rating is the important one here - this is made for hot discharge, which is exactly where a garden hose fails.

Is it reinforced?

No - it is unreinforced by design. That is what keeps it light and manoeuvrable for temporary installations. It also means you should not run it under suction or let it kink in a tight corner.

What colours are available?

Green and orange. On a site or in an occupied house, the orange is worth having - a hose running across a floor is a trip hazard that is very easy to miss.