Plastick flexible conduit connectors,most of them are made of PA, there are two kinds of connector, one is straight,like following pictures, and another one is elbow one,ome is 45 degree and the other one is 90 degree. These connectors are easy and fast to connected with conduits. The IP rate will be up to IP65, if you put the rubber inside the connector, it will get to IP68, but this design is not so popular, as many of the users are no need so high IP rate, as the conduits are always use in land.
And now, there are some conduits conectors are come with brass thread, as the users request strong fixing between the connector and the equipment, not easy to pull the connector out, or hurt to the thread, it is the suitable and good choice to use brass thread with PA body connectors.