Blue Diamond Envir-o® ETA Series Air Pumps with Alarm Size:ET40A Winkler dissolved oxygen test will

Winkler dissolved oxygen test will give false

Biological R440312 788379506629 Ceramic 1

39" x 24" R440357 788379311254 19

2" unions for easy

Do not submerge

Blue Diamond Envir-o® ETA Series Air Pumps with Alarm Size:ET40A Winkler dissolved oxygen test willNote: The Blue Diamond ET series aerators are designed for relatively low pressure. Tubing should not exceed 130' and diffusers should only used in water up to 7' deep. Blue Diamond ETA Series Air Pumps with Alarm have primarily been used in the septic industry, but can be used in any application where it is important to be promptly notified when the air pump has failed to supply air to your aquarium, pond or septic application. Compact, weatherproof