Expander Board - Expander Board Kit, (2Spd Pump 2), (For VS520Z, VS525Z, VS520SZ, VS520DZ, VS523DZ and BP7 systems)
Mfg - Balboa Water Group
Note - Circuit Board, Expander Kit, Balboa VS520Z/525Z/520SZ/520DZ/523DZ, 2-Speed Pump, w/30 Amp Fuse, w/Cables
Balboa PCB, VS/EL Series, Expander, Dual Relay W/Fuse, Part # 55137
Master Spas X801108 Master Spas 501X daughter pc board
Also found as PN - 55137, Master Spas X801108, 59-138-3094, 446621, 59097
55137 BALBOA VALUE SERIES EXPANDER BOARD 55137
Expander, 2-Speed Pump, w/30 Amp Fuse, w/Cables (Cal Spas)
55137 MRQ600-6304 Marquis Spa Expander Circuit Board For Adding A Pump #2 Or Pump #3, Or A Microsilk Pump
55137 59-138-3094 PCB, BWG, 55137, Extender, X-P332, 2-Speed
Used on VS520SZ, VS520DZ, BP7 & BP501 Systems
aka 446621, 59097, 22909 rev C
ACT G1920 Board, Expansion Daughter, Balboa, 2 Speed, With 30A Fuse (X-P332)
APC BB55137 BOARD EXT 2 RELAYS SISTER
HOR G1920 59-138-3094 PCB, BWG, 55137, Extender, X-P332, 2-Speed
replaces 446621
HYQ 33-55137-K PCB, Balboa, VS/EL, Expander, Dual Relay w/Fuse
SPP G1920 3-60-0087 Circuit Board, Expander Kit, Balboa VS520Z/525Z/520SZ/520DZ/523DZ, 2-Speed Pump, w/30 Amp Fuse, w/Cables aka 33-55137-K, 33-0029