Regarding barbs; ive drilled all my ek barbs to 10.3mm and removed all the sharp edges. On the pa tho, i could drill out the barbs to about 12.5mm because they are limited by the neck not the threads. i beet that beats the G1/4 adapter. Tho i want to use 5/8 G3/8 barb if i only can get my hands on 2. And i will shine a torch down my pa when i get home from work...