When replacing a gas hose in the vehicle, many users notice that the old hose suddenly has a right-hand thread connection. This not only looks unfamiliar, but also seems incompatible with the previous connection configuration. What has happened – and which replacement gas hose is the right one?
When replacing a gas hose in the vehicle, many users notice that the old hose suddenly has a right-hand thread connection. This not only looks unfamiliar, but also seems incompatible with the previous connection configuration. What has happened – and which replacement gas hose is the right one?
In many leisure vehicles, gas hose assemblies are installed between the pressure regulator and the fixed piping, featuring a connection configuration of union nut G ¼ LH-UN x pipe nozzle 8. Once the replacement interval is reached, the search for a suitable replacement gas hose begins. However, upon removal, an irritating sight often presents itself: the removed gas hose has one union nut with a right-hand thread and one with a left-hand thread. The reason for this lies in the function of the cutting ring fitting. While technically entirely correct, this often leads to misunderstandings in everyday use. In this article, we explain why this confusion arises, what it means for the replacement of the gas hose in the vehicle, and what to consider when selecting a replacement hose.
Many gas systems in leisure vehicles are equipped with hose assemblies featuring the following connection configurations:
This variant uses the so-called cutting ring connection. During initial installation at the factory or in original equipment, a cutting ring is pushed onto the pipe nozzle together with the union nut and tightened. The cutting ring cuts into the pipe nozzle with the union nut, creating a permanent, gas-tight connection.
However, this type of assembly causes a lasting visual alteration to the pipe nozzle. When the connection is later loosened, the cutting ring and union nut remain on the pipe nozzle. As a result, when removing the old gas hose, it appears as though it had a different connection. When searching for a new hose assembly in specialist shops, it then becomes apparent that such a hose is not available pre-assembled.
When the union nut with the cutting ring is pushed onto the hose with pipe nozzle and tightened, the cutting ring cuts permanently into the pipe nozzle. The component compresses axially and radially onto the nozzle, thereby sealing the connection.
This means: what was originally installed as a pipe nozzle appears, after the hose is removed, to be a threaded connection. The union nut along with the cutting ring remains on the pipe nozzle, creating the impression that the gas hose had a right-hand thread connection.
In other words, the connection configuration has not fundamentally changed – it has merely undergone a visual alteration due to the nature of the connection during disassembly.
Further technical details on the function can be found in the datasheet on cutting ring fittings.
If you wish to replace the gas hose assembly with the connection configuration G 1/4 LH-UN x pipe nozzle 8 (typically item no. 04 436 02 in caravans), please note that the connection is not fully included in the set. You must be sure to order the appropriate connection components separately.
The following components are required:
Both parts are necessary to create a new, gas-tight connection.
If you are unsure, we recommend contacting the manufacturer. You can reach us by email at info@gok.de or by phone at 09332 404-0.
Further technical details can be found in the installation instructions for cutting ring fittings.
This blog will never ask members of the public or unqualified persons to make changes to or fiddle around with technical systems themselves.
In accordance with the Industrial Safety Regulation (BetrSichV), a qualified person must take care of a system which requires monitoring.
A qualified person is someone who has the specific specialist knowledge required. This knowledge is gained by way of a professional apprenticeship, corresponding professional experience or current occupational activity.
Please note that the texts are based on information, regulations and standards for Germany. Please always check the rules and regulations in the relevant country of destination and consult specialists if necessary.
