ST Series high flow Nipples (hydraulic, fluids) up to 6700 psi connect with ST Series high flow Couplers. Parker's ST Series are unvalved quick couplings with manual sleeves providing high flow and low pressure drop. The smooth, straight through flow path allows easy cleaning where the same lines are used for more than one media. These straight through couplers and nipples are available in a wide range of sizes and materials for pressure ranges up to 6700 psi.