Serge: I'd be glad to help. I assume that you need the AN840-4D "Hose Nipple". 1/8" NPT to 1/4" hose in aluminum; the hose end is beaded, not barbed, though (also available in brass). If you do need a barbed fitting, they are available in nylon; and AS&S has an item in 3/8" hose, material not specified ( see http://www.aircraftspruce.com/catalog/hapages/weatherheadhoseends.php ).
Allen G. Wiesner KR-2SS/TD S/N 1118 65 Franklin Street Ansonia, CT 06401-1240 (203) 732-0508 flash...@usadatanet.net