This high density polyethylene threaded filling cap with 3/8-inch I.D. tubing and 50mm Filter (Pack of 5) with membrane allows gas exchange while minimizing the risk of contamination. Has heat sealable flexible tubing. Sterilized by gamma irradiation. Disposable. Size: 33mm. Cap Color: Orange. Cap Style: Vented. Pore Size: 0.2µm. Membrane Material: Polyvinylidene difluoride. Corning® #: 3281.