Hot Springs C30 / C25 Replacement Spa Cartridge Filter Element

A: Outer Diameter: 
Measure the outside diameter of the end cap at the widest point.

B: Filter Length:
Measure the overall length of the cartridge including the end caps.  NB! Do not include any handles, attachments, etc.

All measurements are taken from the outside of the filter.

C: Hole (if applicable):

Measure the centre hole as accurately as possible.