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Pressure Switches
These switches are 1/8" threaded, the most common used in hot tubs. Apply plumber's putty or teflon tape to threads before installing to make a good seal. With metal thread use a 1/2" open wrench and tighten only to snug. With most plastic switches you can simply hand tighten to snug.
25a is most common electrical rating.
These switch are SPNO. This means Single Pole, Normally Open. So you have 2 wire connections and when NOT under pressure the switch is OPEN. This is the most common setup. Some heaters have NC or Normally Closed. But the majority are Normally Open.
Threads are either metal or plastic.

Generic Replacement Pressure Switch Pressure Switch, Tecmark, SPNO Pressure Switch, Tecmark, SPNO, Plastic
Generic Replacement Pressure Switch
Mostly plastic for long life.
Series 3000 pressure switch.
Plastic threads, 1/8", Adjust 1-5 psi, Excellent with Low Flow

Same As: TEC3902 , 52686 , 6200-170C , 3902
Tecmark/Tridelta Series 300 pressure switch.
Plastic threads, 1/8", Adjust 1-100 psi, 25a

Same As: TEC3029P , 611637 , 9137-09A , 3029P
Pressure Switch, Tecmark, SPNO Pressure Switch, Tecmark, SPNO
Tecmark/Tridelta Series 300 pressure switch.
Metal threads, 1/8", Adjust 1-100 psi, 25a

Same As: TEC3029 , 611537 , 9170-14 , 42001-0060S , TDI-85-1002 , 3029
Gecko brand pressure switch.
Plastic threads, 1/8", Adjust 1-5 psi, Comes set 2 lbs
Small Stature. Good for tight areas

Same As: 800315-3 , 800320-3 , 800240-3, 510AD0167