An object of the invention is to provide a method for packing solar battery elements where cracking or chipping does not occur during the packing work and transportation, and the solar battery elements can be easily packed. A piston is operably engaged with a crankshaft. The spool, having a transverse orifice, may be disposed in the third conduit, slidable between a first position where the orifice permits fluid communication between the first and second conduits, and a second position where the spool blocks fluid communication. A lever arm exhibits an elongate and arcuate shape, a first end of which is secured to a fastener extending through apertures in the spaced apart projecting portions.