What snail is this?

[Fishies86]

I've had ones that look like pond snails, and flat spiral type ones, but this is new to me. They burrow in the gravel, and just appeared a couple of weeks ago. What is it?

 

[jetajockey]

Malaysian trumpet snail.

 

[Scouser]

Malaysian trumpet snail.

+1

I believe they help to churn the substrate, helpful with sand bottomed tanks