Dopow PKD Series Branch Reducer Pneumatic Fitting Push-in Pneumatic Fitting design with a releasable stainless steel grab-ring to grip nylon or polyurethane tubing. Release buttons allow for quick assembly and release, a true Push-to-Connect design. Nickel plated brass and sealant are used on all tapered threads and O-rings are on all parallel threads. Internal and external hexagons are standard. http://www.dopow.com/pkd-male-triple-branch-reducer-pneumatic-fitting/