Coupling. Hydraulic Couplings suitable for use with Enerpac hydraulic high pressure pumps and cylinders. The Spee-D-Coupler ;sup>® ;/sup> design enables cylinders or pumps to be disconnected in seconds. The design of the Enerpac Spee-D-Coupler ;sup>® ;/sup> is such that they cannot be connected or disconnected while the hydraulic system is under pressure.