The modgaurd from Kidney Puncher does about the same thing. Here is an e-bay link for something similar with different sizes:
http://www.ebay.com/itm/172063925940?var=470916191001
My Merlin(s) all weep and the modguard will keep them going for a few days but the chamber around the airflow will eventually fill up and juice will weep out of the air flow holes instead of the base. Too bad as the Merlin has the best flavor for a single coil atty that I have tried.
Original Serpent is almost as good in the flavor department but has a really janky JFC. Serpent Mini 22/25 are good but too hot for my liking. Bachelor is also great but they are similar to the Merlin with a press fit base and will weep a bit but not as bad as a Merlin.
Haven't figured out how to get good flavor out of a KF5 but love the design.
The only dedicated single coil tank I REALLY like is a Subtank Plus with the V2 RBA head. Been using the same one daily for well over a year with ZERO issues.
I have been re-building for about 3 years starting with a Russian 91% and have always tried to stick with single coil tanks being a MTL vapor.
Until last week when I picked up a Supreme....best flavor I have ever had out of a tank. Think I will go for dual coil tanks now as all of the dedicated single coil tanks have some issue or issues.