Vendeur: aqua-tics (19.177) 100%, Lieu où se trouve: Leicester, Leicestershire, Lieu de livraison: Worldwide, Numéro de l'objet: 142099323284 Brand: Penn Plax, Water Type: All Water Types, Les Détails: Aquarium Airstone 4" / 10cm longPlease note: Item supplied may be GREEN in colour, not blue as picture shows. Brand new sealed in pack, not loose as picture illustrates. Many uses for all aquariums, fresh or salt water. Ideally replace your airstone every few months to prevent back-pressure on your air-pump due to the air stone clogging up. This will prolong the life of the air-pump diaphragm. When you receive your air stone it is advisable to soak it over night to open up the pores and get the best airflow. We also supply 6" / 15cm, please see our other listings. Thanks for looking!