PermeGear H-Series Stirrers are made for use with our Side-Bi-Side cells. All but the H1 Stirrers have aluminum supply manifolds mounted toward the rear, which connect to a user-supplied heater/circulator. The long horizontal manifold tubes have removable hose barb fittings that allow the water jackets of the diffusion cells to be connected to them with latex tubing. All H-Series Stirrers run at 120v/600rpm or 240v/500rpm.