Selling Siamese Connection from PT Ciptamulti Proteksindo. Siamese Connection is a splitter component that looks like a pipe fitting used to connect a hose from a fire engine or fire brigade with the aim of injecting a water supply from a fire engine outside the building to be pumped to the entire existing fire fighting pipeline network in the building. This component is usually installed above ground in an outside yard and usually a siamese device will be installed near a fence or gate and in outdoor places that are easily accessible and found by fire brigade officers.