Male Pipe Rectus 21KA Interchange Coupler SKU Body Size Threads Material Length HF21KAAW02MPN 1/8 1/8-27 NPT Brass 1.49 HF21KAAW02GMPN 1/8 1/8-28 BSPP Brass 1.49 HF21KAAW04MPN 1/8 1/4-18 NPT Brass 1.61 HF21KAAW04GMPN 1/8 1/4-19 BSPP Brass 1.61