It is a REX brass manifold with plastic value handles. The surged protector and silicon dampened movement helps in maximizing the needle pulsation which provide better and accurate readings. The plastic value are of full size so that they can be operated easily. Features: Forged brass body with plastic valve handles. Forged body is solid brass for durability. Full porting maximizes capacity. Plastic valve handles are of full size for easy operation. Surge protector and silicone dampened movement helps maximize needle pulsation for easier, more accurate readings.