Overview Reviews Product Description Standard galvanized steel pipe nipples are Schedule 40 welded parts with steel material according to ASTM A53 Type F CW. Longer pipe nipples are available on special order. Greenline Industrial Fitting Catalog New Greenline Industrial Fitting Catalog Product Videos Custom Field Product Reviews Write a Review Write a Review × Greenline 4 x 4" Sch. 40 Galvanized Steel Male NPT Nipple G1616G-400X4 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *