An assembly comprising; an assembly longitudinal axis, a tube body, at least a first flange, a transparent tube, at least a first seal gasket, and at least a first attachment mechanism; wherein the tube body has a tube body longitudinal axis, a tube body first end which has a tube body first end contact surface, a tube body second end, a tube body inside diameter, and a window; the transparent tube has a transparent tube first end, a transparent tube first end contact surface, a transparent tube second end, a transparent tube second end contact surface, a transparent tube inside diameter, a transparent tube outside diameter which is less than the tube body inside diameter, and a transparent tube longitudinal axis; the first flange having a first flange longitudinal axis, a first flange seal end, a first flange connection end, a first flange seal surface, and a first flange set surface; and wherein the transparent tube is located inside the tube body; the assembly longitudinal axis, the tube body longitudinal axis, the transparent tube longitudinal axis, and the first flange longitudinal axis are on substantially the same line; the tube body first end contact surface touching the first flange set surface; and at least a portion of the first seal gasket is under pressure and in contact with the first flange seal surface and the transparent tube first end contact surface. an assembly longitudinal axis, a tube body, at least a first flange, a transparent tube, at least a first seal gasket, and at least a first attachment mechanism; wherein the tube body has a tube body longitudinal axis, a tube body first end which has a tube body first end contact surface, a tube body second end, a tube body inside diameter, and a window; the transparent tube has a transparent tube first end, a transparent tube first end contact surface, a transparent tube second end, a transparent tube second end contact surface, a transparent tube inside diameter, a transparent tube outside diameter which is less than the tube body inside diameter, and a transparent tube longitudinal axis; the first flange having a first flange longitudinal axis, a first flange seal end, a first flange connection end, a first flange seal surface, and a first flange set surface; and the tube body has a tube body longitudinal axis, a tube body first end which has a tube body first end contact surface, a tube body second end, a tube body inside diameter, and a window; the transparent tube has a transparent tube first end, a transparent tube first end contact surface, a transparent tube second end, a transparent tube second end contact surface, a transparent tube inside diameter, a transparent tube outside diameter which is less than the tube body inside diameter, and a transparent tube longitudinal axis; the first flange having a first flange longitudinal axis, a first flange seal end, a first flange connection end, a first flange seal surface, and a first flange set surface; and wherein the transparent tube is located inside the tube body; the assembly longitudinal axis, the tube body longitudinal axis, the transparent tube longitudinal axis, and the first flange longitudinal axis are on substantially the same line; the tube body first end contact surface touching the first flange set surface; and at least a portion of the first seal gasket is under pressure and in contact with the first flange seal surface and the transparent tube first end contact surface.