Durso Question

[Eb0la11]

Is it important for a durso standpipe to have a cap on the top of it to prime it at all? I see that in this person's tank and wasnt sure if it was necessary? Or is it just there so you can shove a pipe cleaner down it to clean it?

[fragNplug]

Not to prime it no, it should have a small hole to ajust the air it will need to breath.
If you want to have it easy to clean, put a small joiner pvc near the bottom and put your durso standpipe on top of it and not glue it onto your bulkhead.

Then you can just pull out the full stem and clean it as needed.

[parkinsn]

You need the cap on top with just a small hole to adjust where your water level will be in the overflow box and to dampen the noise.

[banditpowdercoat]

Originally Posted by parkinsn

you need the cap on top with just a small hole to adjust where your water level will be in the overflow box and to dampen the noise.

+1

[Eb0la11]

How does that adjust the water level? And the hole is right in the cap?

[fkshiu]

The water level will be at whatever level the T-fitting is at.

A Durso works by allowing a controlled amount of air into the draining process. The right amount will depend on a number of factors, but having the hole on top is what allows the air to enter. Ideally, you would have some way of controlling the air that gets into the hole with a small ball valve, for instance.