Whatman 0.2um PTFE PolyVENT 1000 Filter Membrane w/ Barb Fittings. 6713-1075 Brand: Whatman Part Number: 6713-1075 Porosity: 0.2um Tubulation Size: 1/2" Barbed $5 Flat Rate Shipping on All Orders! Use eBay Shopping Cart to combine items from multiple listings.