The description doesn't actually say the diameter of the sight glass anywhere. I expected that it would be 1/2" OD like the typical sight gauges used in homebrewing. Instead I received a massive 1/2" ID tube that doesn't fit the sight gauge I was replacing. Also, you won't maybe need a hose clamp to keep it from leaking. You absolutely will need something to clamp it in place, because the tube was still way wider than the post. Those o-rings are useless and will only serve to make you think you're getting something useful when you see the pictures on here.

Bastante practico, fácil de instalar y buen material.