ATLANTIC DIFFUSERS AB-70009 - ATLANTIC DIFFUSERS FINE BUBBLE TUBE DIFFUSER, AB-70009, 2- 5/8" DIA., 20" L, 3/4 FPT - ATLANTIC DIFFUSERS FINE BUBBLE TUBE DIFFUSER, AB-70009, 2- 5/8" DIA., 20" L, 3/4 FPT 20 INCH LONG TUBE DIFFUSER PRODUCING FINE AERATION...