Hydrogen Bubbler - Small - 1/2" Hose Fittings Filters Debris Down To 1 Micron ~ Cleanses Contaminants Such As Potassium & Sodium Hydroxide, Baking Soda etc. Made Of Durable See Thru Plastic Prevents Flashbacks From Entering Your Generator. 7" Tall & 4.5" Diameter ~Also Available - Large 12" Tall Dryer & Different Fittings Available On Amazon 1/4", 3/8" & 1/2" Ships USPS Priority Mail (More than 1 Unit May Ship Standard)