Ailbiuko 24Pcs Brass Pipe Fittings,1/8″ x 1/8″,1/4″ x 1/4″,3/8″ x 1/8″ – 1/2″. Publisher: Ailbiuko. MULTIPLE SIZE: This kit includes 4 sizes of pipe hex coupling fittings, which are 1/8″ x 1/8″NPT female, 1/4 x 1/4″NPT female, 3/8″ x 3/8″NPT female, 1/2″ x 1/2″NPT female, and 24pcs in total.