Mastercool 96503 R404A, R407C, R507A, R134a 4-Way Alum. Refrigerant Manifold features a solid, extruded aluminum body, ball valve design for smooth flow, and an extra large sight glass. Mastercool 96503 also features silicone dampened 3-1/8" gauges. Note: This model is the manifold and gauges only.