These are also called "John Guess" fittings, I get them at Andrew Sherett in Abbotsford (604-850-1987).Usualy available in 1/4" and 3/8" OD. Also lookup some irrigation supply places, there is one good one on (I think) Venables, just one block east of Clark Dr.
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Denis
150g SPS reef;3x250WHQI,Tunze Streams,Wavebox,Neptune Apex,fishroom in basement  ,reefing since 93,SPS since 99.
TOTM June 2010
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