Bubbler with either fritted tip or plain orifice stopper. Bottle has 24/40 joint and 10 cm tube below bulge. Stopper has 12/5 outer joint on inlet arm and 12/5 inner on outlet arm. Fritted tip is porosity C (25-50m). Orifice tip is 1.5mm capillary with end tapered. Approximate capacity, with stopper inserted, 200mL.