First of all, it's a regular M2M that fits into an 18mm Female end of your water piece, and the other end goes into the LSV to connect it to water.
Next, the DDave mod has Metered Airflow, meaning, it has a smaller center in order to reduce airflow, to help produce thicker vapor and hold better flavor (less airy).
Thirdly, the M2M comes with his unique basket screens. These screens are SUPER SUPER easy to pop in and out because they are custom made and have a lip that catches on the edge of the M2M. These basket basically clip into the M2M that he makes, making micro loads very easy (about .04-.07), which also pushes the herb closer to the heater (because it's at the tip of the m2m, and not at the bottom like the regular flat screens), which gives a more even, stronger extraction with ease.
It is also important to note that the basket screens can be removed, and you can use a regular flat screen at the bottom of the M2M for larger bowls, just as you would in the stem, but through water instead.
Any questions, just ask and I can specify further if needed!
@DDave does that about cover it?