This piston & slide is used on the GLV 1.5 and 3.0 and 212, 412 and 612 Stokes® vacuum pumps. The 1.5 and 212 pumps use one (1) of this piston & slide. The 3.0, 412 and 612 pumps use two (2) of this piston & slide. It is equivalent to OEM part # 243-595-011
