Waterway Plastics is proud to design, engineer and produce our quality line of products right here in the USA, using only premium NSF Approved materials & meeting all Certifications and Standards, at our 460,000 sq. ft. facility in Oxnard, CA. Waterway. Committed to innovation & excellence since 1973. Barb Coupling, 1/4" Barb x 3/8" Barb; Part Number: 425-4020