Sr Semi Pro
Zodiac Milpro has developed various collar configurations from conventional inflatable tubes to foam filled tubes and Dshape to fit on the different hulls designs and space needs Inflatable collars are manufactured from heavy duty CSM / neoprene, polyurethane coated fabrics or can be fitted with Zodiac Milpro's Durarib™ foam systems SR is a brand that has virtually no information about online And what information is out there is very sketchy and unconfirmed I'm actually considering buying a late 70's SR SemiPro, so photos of yours would be greatly appreciated!
