Product Information Material: Composite/Brass Seal: Buna-N Male Thread: NPT Select a Product Part NumberMale Thread SizeTube OD 31156018DOT3/8"3/8" 31156011DOT1/8"3/8" 31155618DOT3/8"1/4" 31155511DOT1/8"3/16" 31156014DOT1/4"3/8" 31155614DOT1/4"1/4" 31150411DOT1/8"5/32" 31156218DOT3/8"1/2" 31156022DOT1/2"3/8" 31156222DOT1/2"1/2" 31156214DOT1/4"1/2" 31155514DOT1/4"3/16" 31155611DOT1/8"1/4" 31150414DOT1/4"5/32"