Auto Aqua smart ato tubing size?

[crazyfishlady]

Does anyone know what size tubing this ato uses? Does it plug into or over the little nipple on pump? Bought one used and did not come with tube or holder. Premium thought it was 1/4" but I have some 1/4" here and it is too small. Tia

 

[babbyk]

it goes over the nipple. measure the outside diameter of the nipple and a hardware store should have inner diameter tubing that matches.

 

[Naturalreef]

I thought it was 1/2 OD that I grabbed from lowes that fit perfectly. I'll have to take a look and see if I can find the sticker for you.