Frequently Asked Questions (FAQs) FAQs for Product: Silicone Seal 431 Full Face Masks 400HC103 400HC104 400HC112 1. Will grey foam cushion fit under flexifit series431b full face mask silicone seal? (Posted: 15th Oct, 2008) Question & Answers for Product: Silicone Seal 431 Full Face Masks 400HC103 400HC104 400HC112 Q. Will grey foam cushion fit under flexifit series431b full face mask silicone seal? (Posted: 15th Oct, 2008) A. No, the frame of the 431 doesn't have and way of keeping the foam in place. Back to Top Submit A New Question Can't Find The Answer You're Looking For? Submit Your Question Below: Related Product:  Silicone Seal 431 Full Face Masks 400HC103 400HC104 400HC112 Your Question:  (Please enter One Question Only! You can ask as many questions as you like, but do not combine them into one post!) Your Reply Email Address:  Security Step:  Enter the text to the Left in the space below: [ CLOSE WINDOW ]