Penn Plax Bubble Wall Diffuser 18″ SKU: PPX36 Category: Aquarium Accessories Related products Aquafx 3ft Cabinet & Hood White 36×15 Assembled (Pickup or local delivery only) Foam Base 12×15 (use 3 For 36″ Tank) (PKT 10) Foam Base 12×18 (use for 18″ wide Tanks) (PKT 10) Ammorid Insert Aquaclear Mini / 20 (SOLD OUT)