Yeah - what inganeer said. Some tanks have their own airflow, so that extra distance is not needed. Sometimes size matters so I had to have one for those times.
BTW, I used my MKB with a single RCR123a all weekend on a dual-SS-wick 1.6ohm AGA-T2+. No gold top-cap, regular collection tank with 1xeGo adapter. Who needs a hybrid?
happy as a clown vaping next to our firepit with guests. Mentioning it here because I've found an RCR123a battery allows a fully flush telescope in this configuration. The life isn't the best, but I have 4 of these batteries. And yes the voltage is 3.2v, but my Copper Creek houseblend likes to stay cooler. A little math... should be 6.4watts. Yup, that's the HB sweet spot.