I think i may have found suitable adaptors, you need one male and one female 12mm barb with 18mm GHT thread. These measurement are in inches but i reckon they are spot on. Just waiting on confirmatiom from Matt at Sabco on thread size
http://www.amazon.com/Anderson-Metals-Garden-Fitting-Connector/dp/B0070TUXOC/ref=sr_1_2?s=industrial&ie=UTF8&qid=1360122794&sr=1-2&keywords=male+barbed+hose+adapters+ght
http://www.amazon.com/Anderson-Metals-Garden-Fitting-Connector/dp/B0070TV3IW/ref=sr_1_3?ie=UTF8&qid=1360122584&sr=8-3&keywords=female+barbed+hose+adapters+ght
http://www.amazon.com/Anderson-Metals-Garden-Fitting-Connector/dp/B0070TUXOC/ref=sr_1_2?s=industrial&ie=UTF8&qid=1360122794&sr=1-2&keywords=male+barbed+hose+adapters+ght
http://www.amazon.com/Anderson-Metals-Garden-Fitting-Connector/dp/B0070TV3IW/ref=sr_1_3?ie=UTF8&qid=1360122584&sr=8-3&keywords=female+barbed+hose+adapters+ght
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