$11 ULTON Jorda B RDA MTL Rebuildable Dripping Atomizer w/BF Pin/ Transparent Cap/ SS Cap
https://www.2fdeal.com/ulton-jorda-b-rda-mtl-rebuildable-dripping-atomizer-w-bf-pin-transparent-cap-ss-cap-silver_p5538.html

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Features
510 threading;
Delrin drip tip;
Normal and bottom feeder pin;
Different airholes (1.5mm, 2mm, 3mm);
The transparent cap is same as the built in cap for smaller size of airhole;
Easy to build flavor chaser for the MTL or restricted DL users