Dopow PKB Male Triple Pneumatic Fitting,BSPT/ NPT are design with push-to-connect design. suitable for 4 mm air tubing,6 mm tubing,8 mm air tubing ,10 mm air tubing,12 mm air tubing, 14 mm air tubing,16 mm air tubing. http://www.dopow.com/pkb-male-triple-pneumatic-fitting/