Style 90 boltless compression couplings and fittings have been installed on water service lines where they have helped to speed installation and cut costs. Style 90 couplings and fittings consist of a cast iron or forged steel body; two resilient, specially compounded gaskets; two steel, self-centering protective gasket retainer cups; and two heavy end nuts. All fittings are shipped assembled, ready-to-use and install in just a few minutes.