Set Comes with 1pc Flange (Made of Polypropylene Plastic) 1pc Duckbill Valve (Made of Silicone) Material does NOT contain BPA. Can be sanitized with, boiling water, water steam or microwave-steam bags. Not Original Spectra Breastpump Accessories. Not Original Spectra Breastpump Parts. All pump parts made for Dula Dula Breastpump parts perform as well as OEM parts. Interchangeable and compatible with Spectra breastpump parts. Ideal Spectra replacement for Spectra Duckbill Valve (Spectra Valve), Spectra Backflow Protector, Spectra flange, Spectra Tubing, Wide-Neck Spectra Bottle.