Scubapro MK 5 OEM part #'s for the 'piston' ?

[scubafanatic]

I while back I bought (3) MK 5 pistons with part # : 10-101-003, then this past week bought (2) MK 5 pistons (at least they were advertised as being for the MK 5) with part #: 10-600-103.
Are both part #'s really pistons for MK 5's ? The 10-600-103 appears to be the 'newer' shouldered version of the piston, which is fine, but the piston head groove where the big O-ring would be installed is noticeably wider than the same groove on the non-shouldered piston part # 10-101-003, so I'm wondering if part # 10-600-103 really is for a MK 5 ?

Thanks in advance!

Karl

 

[redacted]

My schematics show a 10-600-103 as being a Mk15 piston. That wider groove accommodates the backup ring.

Also, my schematic shows the 10-101-103 as being the newer shouldered version of a Mk5 piston. I do not have a reference for a pn for the non-shouldered version.

 

[scubafanatic]

My schematics show a 10-600-103 as being a Mk15 piston. That wider groove accommodates the backup ring.

Also, my schematic shows the 10-101-103 as being the newer shouldered version of a Mk5 piston. I do not have a reference for a pn for the non-shouldered version.

Thanks for the clarifications! Yea, I somehow doubted the 10-600-103 really was for a MK 5, the wider groove is just too wide to see how it could work for a MK 5,

Karl

 

[peege]

Also, my schematic shows the 10-101-103 as being the newer shouldered version of a Mk5 piston. I do not have a reference for a pn for the non-shouldered version.

I think you meant 10-101-003? I see shouldered and other models with the XX-XXX-003 (not 103).