Pneuflex's model of SPOC 08-04 is 8mm tubing x R, PT, BSPT 1/2 thread hex socket head male straight stainless steel push to connect fittings, round shaped body with internal hexagon. Connect 8mm pneumatic tube and installed to the R 1/2 female thread, closely spaced is possible. 8mm x R 1/2 stainless steel round male straight push in fittings are made entirely of high grade stainless steel material which can withstand aggressive environment, commonly used in food or pharmaceutical industries.