Cole-Parmer Hose Barb Reducer 1/4 in. ID - 1/8 in. ID 30 Fittings

Cole-Parmer Masterflex 30703-50 Hose Barb Reducer – 1/4 in. ID to 1/8 in. ID, PVDF

The Cole-Parmer 30703-50 (also cataloged under Masterflex SKU EW-30703-50) is a straight, barbed reducing union engineered for critical fluid handling, low-pressure plumbing, and single-use laboratory applications. Molded from premium Polyvinylidene Fluoride (PVDF), commonly known as Kynar, this chemical-resistant fitting forms a straight inline bridge between flexible tubing lines of disparate sizes, reducing from a 1/4-inch inner diameter (ID) down to a 1/8-inch ID. The sharp, precision-molded barbs grip the interior walls of flexible tubing, leveraging the elastomer's natural elasticity to establish a tight, leak-proof mechanical seal without the need for specialized installation tools.

Technical Performance and Design

• High-Purity PVDF Matrix: Polyvinylidene Fluoride offers exceptional mechanical strength, a high temperature threshold, and robust resistance to UV radiation, ozone, and aggressive industrial chemicals. It is inherently bio-inert, minimizing the risk of trace extractables leaching into the fluid pathway.

• Precision Barbed Geometry: The single-piece molded design features distinct, sharp barbs that slide smoothly into flexible tubing but resist backing out under typical inline pressure spikes up to 30 PSI.

• Smooth Internal Orifice: The inner channel transitions gradually from the larger diameter to the smaller diameter, optimizing flow dynamics, minimizing fluid turbulence, and preventing dead spots where particulates or bacteria could accumulate.

• Broad Sterilization Tolerance: Highly resilient to rigorous laboratory decontamination protocols; the fitting can be repeatedly autoclaved up to 121°C or treated with Ethylene Oxide (EtO) gas without losing its structural integrity or embrittling.

Product Specifications

• Catalog Number / MPN: 30703-50 (EW-30703-50)

• Product Line: Masterflex / Cole-Parmer

• Fitting Style: Straight Hose Barb Reducer / Coupler

• Port 1 (Large End): 1/4 inch Tubing ID

• Port 2 (Small End): 1/8 inch Tubing ID

• Material: Polyvinylidene Fluoride (PVDF / Kynar)

• Operational Temperature Range: -80°F to 265°F (-62°C to 129°C)

• Maximum Pressure Limit: Generally rated for low-pressure applications under 30 PSI (dependent on tubing material and clamping hardware)

Key Benefits & Applications

• Peristaltic Pump Lines: Designed to adapt Masterflex pump head tubing to smaller or larger analytical distribution lines, acting as a baseline hardware bridge in dosing and sampling systems.

• Biopharmaceutical Processing: Highly valued in single-use biopharma assemblies due to the PVDF compound's compliance with strict sanitary protocols and trace-extractable limitations.

• Corrosive Chemical Transfer: Safe for routing aggressive acids, heavy solvents, halogens, and alcohols that would rapidly degrade standard nylon or polyethylene fittings.

• Environmental Water Sampling: The bio-inert nature of Kynar prevents heavy metal or plasticizer contamination during ultra-pure water testing and trace-organic fluid collections.

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