{"product_id":"34-mpt-flow-switch-q12n50","title":"3\/4\" MPT Flow Switch Q12N50","description":"\u003cp\u003eThe Harwil Q12N50 3\/4\" MPT flow switch is a precision sensor designed for spa and hot tub circulation systems. This normally open (NO) flow switch monitors water flow through your spa's plumbing, automatically shutting down heaters when flow drops below safe levels to prevent costly damage from dry-fire conditions.\u003c\/p\u003e\u003cp\u003eBuilt with 3 SM specifications and featuring a durable 6-foot lead wire rated for 1\/2 amp switching capacity, this OEM-quality sensor delivers reliable performance in demanding spa environments. The 3\/4\" male pipe thread connection ensures secure installation in standard spa plumbing configurations. At Bubbles Supply, we guarantee an exact fit for your application, ship same-day from our Canadian warehouse, and back every sensor with a full 1-year warranty. Professional installation recommended to ensure proper flow rate calibration and optimal heater protection.\u003c\/p\u003e\n\u003c!-- p11:start --\u003e\u003cdiv class=\"related-links\"\u003e\n\u003ch2\u003eRelated parts \u0026amp; guides\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/product\/1-mpt-19gpm-flow-switch-q8dsa\"\u003e1\" MPT 19GPM Flow Switch Q8DSA\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/product\/12-mpt-flow-switch-q-12ds-c2-beach\"\u003e1\/2\" MPT Flow Switch Q-12DS-C2-BEACH\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/product\/12-mpt-flow-switch-q12ds\"\u003e1\/2\" MPT Flow Switch Q12DS\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collection\/sensors-1\"\u003eSee all Sensors\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/knowledge\/how-to-test-a-spa-flow-switch\"\u003eHow to test a spa flow switch\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003c!-- p11:end --\u003e","brand":"Harwil","offers":[{"title":"Default Title","offer_id":50248997929317,"sku":"Q12N50","price":100.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0883\/2162\/2373\/files\/34-mpt-flow-switch-q12n50-q12n50-3_7a21ea10-3db1-4e78-a129-98a01ba09595.jpg?v=1779739427","url":"https:\/\/checkout.bubblessupply.com\/products\/34-mpt-flow-switch-q12n50","provider":"Bubbles Supply","version":"1.0","type":"link"}