Hi. I'm having a go at building a 16mm scale gas fired 040 loco. The boiler can be filled via a Goodall valve (assume that's the guy who designed this valve). The Engineering isn't a problem but being new to 16mm I'm stuggling with suppliers, I've found plenty who sell complete parts wheels burners regulators lubricators ete etc. But where can I buy silicon tube I need something 3mm bore and about 4mm od, anyone out there in the 16mm world got any clues, thanks in anticipation.