#152

This video covers the internal and external differences of seemingly similar k type inflators. The video also covers a trick in case you do not have access to the normal kvalve disassembly tool. Since this video, in 2020, a third version has appeared. This is an OEM inflator made by Ocean Diving Systems and used by some BCD manufacturers. It is distinguished by grey inflation and deflation buttons. It also has a manufacturer code of ODS and a date stamp on the rim of the inflator assembly cartridge.

This k inflator cannot be easily disassembled for oring maintenance. BCD manufacturers who use this inflator, recommend not attempting to service the orings and to just replace the entire inflator or inflator cartridge assembly. You cannot be guaranteed to be able to find a compatible inflator or inflator cartridge on a trip. So, your choice in this situation is to either carry an additional inflator or inflator cartridge on any trip.

Alternatively, you can replace the non-serviceable inflator cartridge with one that can be disassembled and serviced. Fortunately, the plastic inflator housing is sufficiently compatible with other versions of this for the serviceable inflator cartridges to be a direct replacement. This is the approach which we recommend.

Update to the update:
The ODS inflator can actually be disassembled with the right tools and some perseverance. It is difficult to disassemble due to the fact that the internal shaft has threads on both ends. While unscrewing, it is likely that the grey button will unscrew leaving the shaft captive in the inflator cartridge. In order to service the oring, the shaft must come out. To do this the top of the shaft were the button was needs to be pressed as far as possible into the housing. There is then sufficient clearance to hold the shaft with a small pair of needlenose pliers. The nut on the bottom that was used to screw off the button, can now be used to uscrew the nut on the bottom of the shaft. The shaft will get scored by the needle nose pliers in this process, but since that part is not a sealing surface, it will not cause any problems. Make sure you tighten the end nut sufficiently or use lock time when reassembling.