Ribbed Pipe Fittings

I have looked endlesly for engeneering 3D models to have standarised pipe fittings. As I found none, or at least none thet were printable I made my own fittings.
This are 1 Inch and 3/4 Inch male/Female pipe fittings and should work with any industrial pipes, the fit might be a little loose/tight, but that can be adjusted by resising the model a bit to fit whatever youre building.
Feel free to use and modify this fittings in order to create whatever complex models or machines you wish, just