The Balboa 58115 flo-thru heater assembly has the following features and specifications.
Series: M7, GS500, GS501, GS510, GS511 (but not limited to, unless specified otherwise above).
Manifold Length: 15"
Manifold Diameter: 2"
Stainless Steel: Yes
Stainless Steel Grade: 800 Incoloy
Heating Element Included: Yes
Kilowatt Rating: 2.0KW
Temperature Sensor Included: Yes
Hi-Limit Sensor Included: Yes
Gaskets Included: Yes
Split Nuts Included: Yes
Tail Pieces Included: Yes (removable)
Tail Piece Size: 2" x 2" (removable)