I honestly have no idea about the transformer bong, but from past expirience I have always put water in my percs
http://forum.grasscity.com/index.php?/topic/1358119-Transformer-tubes-review Transformer tubes review I'd ask the guy who started this thread. He seems rather knowledgeable about those transformer tubes.
yo so I am high strolling through transformer tubes tags and see someone tag me and call me knowledgeable and I'm just sitting here like feels nice to be appreciated thanks grass city community