Specification:CO2 Glass Diffuser Kit with U Bend & NRV Diffuser length: 62.8mm/2.47inU shape glass tube length: 65.4mm/2.57inDiameter of U shape glass and diffuser glass: 2mm/0.07in Feature:1.Solid glass, nice-looking and uneasy to break,U-shaped air intake.2.Check valve with stable performance.3.Bu