Harwil Reed Flow switch common to systems using Gecko and Hydroquip electronics and Laing heaters. Thread diameter : 3/4"Grey probe length : 1-3/8"
Thread diameter : 3/4"Grey probe length : 1-7/8"
Aqualarm flow switch with 1.5" slip connections. Normally open switch, 0.5 Amp.
The MOST common Harwil reed flow switch. This is the switch only and will fit both styles of Tee, pictured. With a cable and plug.