The Carvin 42370210K Jacuzzi TC330-MB Internals Kit features three round cartridges and is the compatible replacement for the original TC300 triangular shape assembly.
Features:

• 3 round cartridges 110-sq ft cartridges
• 3 cartridge supports
• 1 bottom manifold 
• 1 O-Ring 1.25-in
• 1 O-Ring 2.5-in 

This is the complete internal assembly for the Jacuzzi Tri-Clops TC-330 cartridge filter. This complete internal assembly will replace the older assembly used in the TC-300 filter. This assembly includes all the internal parts needed to convert an older TC-300 to the newer style TC-330.