SMC KQH11-35S fitting, male connector, KQ ONE TOUCH FITTING sold in packages of 10; price is per piece
KQ uni-fit one-touch fittings only require hand tightening to assemble and a snug of the wrench to attain a positive seal in 1/3 of the time of conventional fittings. The innovative design allows use of uni-fit one-touch fittings with NPT, NPTF, RCPT, and GPF threads making the uni-fit design both versatile and time saving. KQ fittings give you identical heights when used in manifolds or other side by side applications enhancing the appearance of your equipment.
Allied Electronics:
Fitting, male connector, 1/4NPT port, for 3/8 OD tube