The Bullfrog Spas 65-2020 flo-thru heater assembly has the following features and specifications.
Series: M7 (but not limited to, unless specified otherwise above).
Manifold Length: 15"
Manifold Diameter: 2"
Stainless Steel: Yes
Heating Element Included: Yes
Kilowatt Rating: 4.0KW / 1.0KW
Voltage Rating: 240V / 120V
Mounting Studs: Yes
Number of Mounting Studs: 2
Temperature Sensor Included: Yes
Hi-Limit Sensor Included: Yes
Number of Threaded Taps: 2
Threaded Tap Location(s): Sensor taps approximately 2" from leading end and 13" from leading end @ 12 O'Clock.
Tail Pieces Included: Yes (removable)
Tail Piece Size: 2" x 2" (removable)