Its a 3 way air splitter. . I can tell you it is low pressure as the o-ring is a compression fit. It works with the type of equipment provided in the link to run multiple air lines from one source. They are universal for the thread size which is a metric straight thread. This link and the one below shuold give you the full picture. ............. https://www.samsclub.com/sams/autostyle-air-manfld-automotive-style-man/prod19721920.ip?pid=_CSE_Google_PLA_813405&source=ifpla&CAWELAID=730010300000560400&adid=22222222627000037996&wl0=&wl1=g&wl2=c&wl3=104962377875&wl4=pla-88120304579&wl5=9021375&wl6=&wl7=&wl8=&wl9=pla&wl10=1247713&wl11=online&wl12=813405&wl13=&wl15=26916396155&wl17=1o9&veh=sem

Its a 3 way air splitter. . I can tell you it is low pressure as the o-ring is a compression fit. It works with the type of equipment provided in the link to run multiple air lines from one source. They are universal for the thread size which is a metric straight thread. This link and the one below shuold give you the full picture. ............. https://www.samsclub.com/sams/autostyle-air-manfld-automotive-style-man/prod19721920.ip?pid=_CSE_Google_PLA_813405&source=ifpla&CAWELAID=730010300000560400&adid=22222222627000037996&wl0=&wl1=g&wl2=c&wl3=104962377875&wl4=pla-88120304579&wl5=9021375&wl6=&wl7=&wl8=&wl9=pla&wl10=1247713&wl11=online&wl12=813405&wl13=&wl15=26916396155&wl17=1o9&veh=sem

References:

http://www.ebay.com/itm/10-Pcs-5mm-Male-Thread-4mm-Push-In-Joint-Pneumatic-Co...