P/N 54108 VL801D.

It is a direct replacement for the Spaform SF273 system topside

It also fits GS501DZ, 510DZ, 511DZ, 523DZ, M3TUV, Elite M7. , Catalina, Hydrospa, Aegean, Hot Tubs Direct, Leisurerite, DIY tubs by Hindhead Hot Tubs

It is a Deluxe Digital panel with a decal showing Time, Mode, Warm, Cool, Blower, Jets 1, Light & Jets 2 with a large LCD display.

187mm x 83mm / Telephone cord style