Water Treatment ComponentsDouble Male ConnectorContact Us to PurchaseFeatures Suitable using in RO drinking system, purifier, water treatment system...etc. Specification Model Type Spec. Remark FI-0064 double male connector 1/4 NPT x 1/4 NPT Made in Taiwan FI-0029 double male connector 3/8 NPT x 3/8 NPT Made in Taiwan FI-0028 double male connector 1/2 NPT x 1/2 NPT Made in Taiwan FI-0027 double male connector 3/4 NPT x 3/4 NPT Made in Taiwan Application Avoiding leaking, need to collocate the same diameter pipes to fittings.