Overview Reviews Product Description The Lincoln Interchange Couplers come with hardened steel balls and stainless steel springs. The plugs are heat treated to reduce wear on mating surfaces. Lincoln Interchange couplings are easily identified by the long plug end. Greenline Industrial Fitting Catalog New Greenline Industrial Fitting Catalog Product Videos Custom Field Product Reviews Write a Review Write a Review × Greenline 1/4 x 1/4" Steel Lincoln Pneumatic Nipple - Male NPT CP27 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *