You will never get an answer from H.O ! I have been trying to make contact for the last 2 years to replace a lens plate for my 4.5 !! Last year in August I went to their website and place an order for a replacement lens. I received an email from Terri Mackay at H.O who said because of an interruption in their supply ,it would be til October before I would receive my order ! Well October came and went ! The owner/inventor of this mask a Jon Kranhouse still resides in L.a as far as I know , I had tried to make contact with him ,no luck ! Why they would close shop with no explaination to its customers is beyond me ! and why leave the website up and running !!! I went as far as calling a dive shop in Hollywood who was listed as a retailer for H.O ,he tried his sources to make contact but was unable to .
So to find a mask I went to ebay and got one. They are on there every so often . As far as the order to hydrooptix for the lens the payment via debit has not been charged to date. I wish you luck !