Features:
Solid PC as crystal as glass, unbreakable to use.
Diffuser: apply ceramic material to create more stable & fine bubbles.
U-shaped Tube: no bending needed, beautiful convenient to use.
Bubble Counting: no need of extra counter, clear to see & calculate bubbles.
Inside Check Vavle: avoid water-returning easily.
Double sealed diffuser, dismountable to clean, leak-proof.