Male Pipe Mold Coolant Plug SKU Body Size Threads Material HFPN251 1/4 1/8-27 NPTF Brass HFPN252 1/4 1/4-18 NPTF Brass HFPN253 1/4 3/8-18 NPTF Brass HFPN352 3/8 1/4-18 NPTF Brass HFPN353 3/8 3/8-18 NPTF Brass HFPN354 3/8 1/2-14 NPTF Brass HFPN554 1/2 1/2-14 NPTF Brass HFPN556 1/2 3/4-14 NPTF Brass