Coupling heads and Overrun devices
Coupling heads and coupling units, sometimes also called overrun devices are all vital accessories when it commes to attaching the trailer onto your vehicle in a safe manner. At our online store, you will find plenty of coupling heads and coupling units, which have been produced by renowned manufacturers such as AL-KO, KNOTT, WINTERHOFF and STEELPRESS. The accessories in question boast a GVW values ranging between 700 and 3500 and are available at very affordable prices. If you want to travel risk-free with your trailer, simply get your hands on a coupling unit today and save yourself from all the hassle.
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Shock absorber for overrun device/brake AL-KO 161S (old type) for 1600kg trailer
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135,99 €56715 PTS
- For the coupling unit:
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AL-KO 7/13 pin plug holder - universal size
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2,49 €1038 PTS
- Model:
- Intended for::
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AL-KO overrun damper 2.8 VB/1 3500 kg
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179,99 €75065 PTS
- For the coupling unit:
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WINTERHOFF WW8-E ball hitch for 800kg trailer with 50mm square drawbar
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13,99 €5835 PTS
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AL-KO 2.8VB1 overrun device with AK351 hitch for 3500kg trailer with square drawbar
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888,99 €370753 PTS
- Drawbar profile:
- Drawbar:
- GVW:
- Nose load:

WINTERHOFF WW8-G ball hitch for 800kg trailer with 60mm square drawbar
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14,39 €6001 PTS

WINTERHOFF WW8-Y ball hitch for 800kg trailer with V-type drawbar
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16,99 €7086 PTS

WINTERHOFF WW8-A ball hitch for 800kg trailer with 50mm tubular drawbar
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15,39 €6418 PTS

WINTERHOFF WW8-D40 ball hitch for 800kg trailer with 40mm square drawbar
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15,49 €6460 PTS

Bellow for overrun device AL-KO 161S/251S/251G FI50
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9,49 €3958 PTS

AL-KO AK7 ball hitch for 750kg trailer with 60mm square drawbar
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16,69 €6961 PTS

STEELPRESS ZSK-0750H ball hitch for 750kg trailer with 50mm square drawbar
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15,49 €6460 PTS

KNOTT KQ14-A ball hitch for 1400kg trailer with 50mm square drawbar
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30,99 €12924 PTS

KNOTT K27-A ball hitch for a 2700kg trailer with a 50mm pipe drawbar, cast iron
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64,99 €27104 PTS
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Plug holder cover WINTERHOFF W1707 universal 7-PIN and 13-PIN for trailer
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1,99 €830 PTS

AL-KO 251S overrun device with AK270 hitch for 2700 kg trailer with V-type drawbar
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302,79 €126279 PTS
- Drawbar profile:
- GVW:
- Nose load:
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AL-KO 90S/3 overrun device with AK161 hitch for 1000 kg trailer with V-type drawbar
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257,29 €107303 PTS
- Drawbar profile:
- GVW:
- Nose load:

AL-KO 161S overrun device with AK161 hitch for 1600 kg trailer with V-type drawbar
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282,99 €118021 PTS
- Drawbar profile:
- GVW:
- Nose load:
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KNOTT KF27B overrun device with K27A hitch for 2700 kg trailer with V-type drawbar
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327,99 €136788 PTS
- Drawbar profile:
- GVW:
- Nose load:

KNOTT K7.5-L ball hitch for 750kg trailer with 60mm square drawbar
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25,69 €10714 PTS

WINTERHOFF WW8-C ball hitch for 800kg trailer with 70mm tubular drawbar
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17,49 €7294 PTS

WINTERHOFF WW8-B ball hitch for 800kg trailer with 60mm tubular drawbar
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16,49 €6877 PTS

WINTERHOFF WW8-H ball hitch for 800kg trailer with 70mm square drawbar
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16,99 €7086 PTS

WINTERHOFF WW150-VG ball hitch for 1500kg trailer with 70mm square drawbar
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32,99 €13758 PTS

AL-KO AK161 ball hitch for 1600kg trailer with 50mm tubular drawbar
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68,99 €28772 PTS

AL-KO AK301 ball hitch for 3000kg trailer with 50mm pipe drawbar, cast iron
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89,79 €37447 PTS

Rubber bellows - KNOTT KF7,5-KF30 protective rubber
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9,99 €4166 PTS

Rubber bellows - KNOTT KF27-KF35 safety rubber
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9,99 €4166 PTS

Trailer bellow - rubber protection for KNOTT overrun device KFG35
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17,99 €7503 PTS

Shock absorber for overrun device AL-KO 251S 2700 kg - new model
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68,99 €28772 PTS
- For the coupling unit:
- GVW:

KNOTT K14-A ball hitch for 1400kg trailer with 50mm tubular drawbar
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35,89 €14968 PTS

KNOTT KK14-B ball hitch for 1400kg trailer with 45mm tubular drawbar
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48,99 €20431 PTS

AL-KO 251S overrun device with AKS3004 hitch for 2700 kg trailer with V-type drawbar
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564,99 €235629 PTS
- Drawbar profile:
- GVW:
- Nose load:

AL-KO 161S overrun device with AK161 hitch for 1600kg trailer with square drawbar
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391,99 €163479 PTS
- Drawbar profile:
- GVW:
- Nose load:

AL-KO 251G overrun device with AK301 hitch for 3000 kg trailer with V-type drawbar
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403,69 €168359 PTS
- Drawbar profile:
- GVW:
- Nose load:

AL-KO 251S overrun device with AK270 hitch for 2600kg trailer with square drawbar
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406,99 €169735 PTS
- Drawbar profile:
- Drawbar:
- GVW:
- Nose load:

AL-KO AK351 ball hitch for 3500kg trailer with 60mm pipe drawbar, cast iron
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162,99 €67975 PTS

KNOTT KF13E overrun device with KK14B hitch for 1400 kg trailer with V-type drawbar
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284,99 €118855 PTS
- Drawbar profile:
- GVW:
- Nose load:

KNOTT KF20A overrun device with K20B hitch for 2000 kg trailer with V-type drawbar
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328,99 €137205 PTS
- Drawbar profile:
- GVW:
- Nose load:

KNOTT KF17A overrun device with K20B hitch for 1700 kg trailer with V-type drawbar
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305,99 €127613 PTS
- Drawbar profile:
- GVW:
- Nose load:

KNOTT KFG30A overrun device with K35A hitch for 3000 kg trailer with V-type drawbar
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546,99 €228122 PTS
- Drawbar profile:
- GVW:
- Nose load:

KNOTT KFG35D overrun device with K35C hitch for 3500 kg trailer with V-type drawbar
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757,99 €316120 PTS
- Drawbar profile:
- GVW:
- Nose load:

AL-KO AK270 ball hitch for 2700kg trailer with 50mm tubular drawbar
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73,99 €30858 PTS
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Shock absorber for trailers AL-KO 101VB/90S
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88,99 €37113 PTS
- For the coupling unit:
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AL-KO 60S/2 overrun device with AK161 hitch for 750kg trailer with V-shaped drawbar
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248,99 €103841 PTS
- Drawbar profile:
- GVW:
- Nose load:
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AL-KO 161S overrun device with AK161 hitch for 1600kg trailer with square drawbar
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410,99 €171403 PTS
- Drawbar profile:
- Drawbar:
- GVW:
- Nose load:
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WINTERHOFF WW13-N ball hitch for 1500kg trailer with 45mm tubular drawbar
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40,99 €17095 PTS
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WINTERHOFF WW150-RB ball hitch for 1500kg trailer with 50mm tubular drawbar
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42,99 €17929 PTS
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Support bracket for overrun device AL-KO 150 mm
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8,99 €3749 PTS
- Material:
- Height:
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AL-KO AKS3004 ball hitch with stabilizer for 3000kg trailer with 50mm tubular drawbar
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551,99 €230207 PTS
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KNOTT KF27B overrun device with K27A hitch for a 2700 kg trailer with a V-shaped drawbar and a support wheel bracket
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364,99 €152219 PTS
- Drawbar profile:
- GVW:
- Nose load:
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STEELPRESS ZSK-0750J ball hitch for 750kg trailer with 70mm square drawbar
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24,89 €10380 PTS
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Coupling heads
Coupling heads are used to attach the trailer onto a vehicle. There are many different types of coupling heads - coupling heads for V-shaped drawbars, coupling heads for T-shaped drawbars, coupling heads for pipe-shaped drawbars etc. The main point of difference between them however, is their maximum permissible GVW value, maximum load capacity of the coupling hook and last but not least, their spacing between mounting holes, which can all vary from model to model. In the case of coupling heads available in our online store, all the information that you need for individual coupling models can be found on the product's page.Coupling heads are equipped with a wear indicator, which helps to assess when the accessory in questions needs replacing. Another helpful source of information about the coupling head is the coupling correctness indicator, with the aid of which trailer users assess whether or not the trailer has been correctly connected onto a vehicle.
Trailer coupling units
Trailer coupling units also known as overrun devices are trailer accessories which are made up of not only a braking system but also of a coupling head and a steel casing, which connects the device together. It is possible to replace individual coupling unit parts rather than then whole set. It is also possible to equip the unit with shock absorbers.Coupling units for heavy-duty braked trailers with a GVW of 750kg or more are mounted onto drawbars of regular car trailers and tow trucks. There is no need to assemble a coupling unit onto a light-duty trailer, as it is required neither by law nor by sheer laws of physics, which would otherwise demand for a heavy-duty trailer to be equipped with such an accessory. Using a coupling unit will therefore increase safety levels when your trailer is in drive mode and will thus significantly decrease the force exerted on your car's brake system.
Car trailer coupling heads and coupling units
The more a car trailer coupling unit is used, the more likely it is that it is going to fall victim of natural wear and tear. Before you head off on a long trip, it is worth checking the wear indicator of the coupling unit and the coupling head.Coupling units are the only trailer element apart from the brake cord which connect the trailer with the towing vehicle. Assemblying the trailer coupling unit correctly is the first step which needs to be taken in order to reassure oneself of a safe drive. Here, at Unitrailer, we care about high quality products. It is for this reason that we sell only AL-KO, KNOTT, WINTERHOFF and STEELPRESS coupling units, as they offer the highest possible quality on the market. Choose the right coupling unit today and take care of your brake system the right way!