Tecmark pressure switch model 4010P 1/8" MPT male-part threads plastic connection Will not oxidize or rust.
It is perfect for salt water & high moisture areas. 0.5 to 11 P.S.I. adjustable pressure detection 21 Amp / 250V / SPNO
The 4010p can also be used as a replacement for the 3029 & 3029p.
Works on all Gecko's / SpaBuilders SSPA / MSPA / TSPA / U-Class / S-Class / M-Class Balboa instruments prior to M7 system, all pressure switch technology spa packs