{"product_id":"tecmark-1-5-psi-1-8-npt-pressure-switch-3903-bp","title":"TECMARK 1-5 PSI 1\/8 NPT PRESSURE SWITCH - 3903-BP","description":"\u003cdiv class=\"flex flex-col text-sm pb-25\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:8adb9782-7326-4b33-a569-6cbbc187735e-19\" data-testid=\"conversation-turn-40\" data-scroll-anchor=\"true\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"d8bb08ac-9361-4069-9d05-16ce6b9f6ab1\" data-turn-start-message=\"true\" dir=\"auto\" data-message-model-slug=\"gpt-5-mini\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\"\u003e\n\u003cp data-start=\"80\" data-end=\"503\"\u003eThe \u003cstrong data-start=\"84\" data-end=\"111\"\u003e3903‑BP pressure switch\u003c\/strong\u003e from Tecmark (also sold under part numbers like 5‑20‑0008, TDI3903BP) is a simple, reliable safety‑related component used in spa and hot tub control systems. It monitors water pressure in the heater or plumbing system and sends an electrical signal when the correct pressure (flow) is present, helping the control board manage heater operation safely. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"505\" data-end=\"1564\"\u003e\u003cstrong data-start=\"505\" data-end=\"559\"\u003eTecmark 1‑5 PSI 1\/8″ NPT Pressure Switch – 3903‑BP\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"505\" data-end=\"1564\"\u003eReliable Flow\/Pressure Detection — Converts water pressure into an electrical trigger so the heater or control system only activates when sufficient flow\/pressure exists.\u003c\/li\u003e\n\u003cli data-start=\"505\" data-end=\"1564\"\u003e1‑5 PSI Set Point — Factory‑set at approximately 1.5 PSI and not adjustable; ideal for standard spa applications.\u003c\/li\u003e\n\u003cli data-start=\"505\" data-end=\"1564\"\u003e1\/8″ NPT Connection — Standard male pipe thread fits directly into heater pressure switch ports or 1\/8″ tapped plumbing.\u003c\/li\u003e\n\u003cli data-start=\"505\" data-end=\"1564\"\u003eSPST Switch Type — Single pole, single throw configuration commonly used in spa safety circuits.\u003c\/li\u003e\n\u003cli data-start=\"505\" data-end=\"1564\"\u003e3 Amp Rated — Supports up to 3 amps of control load for typical spa control board connections.\u003c\/li\u003e\n\u003cli data-start=\"505\" data-end=\"1564\"\u003eDurable Construction — Plastic threaded body and internal diaphragm designed for long life in hot, wet environments.\u003c\/li\u003e\n\u003cli data-start=\"505\" data-end=\"1564\"\u003ePart No.: \u003cstrong\u003e3903‑BP\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1566\" data-end=\"1885\"\u003e\u003cstrong data-start=\"1566\" data-end=\"1594\"\u003eWhy choose this product?\u003c\/strong\u003e\u003cbr data-start=\"1594\" data-end=\"1597\"\u003eThis pressure switch is an essential safety component for spa heater systems. Replacing a faulty switch restores proper pressure\/flow detection, prevents heater dry‑fire conditions, and helps ensure efficient and safe operation of your spa equipment. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e","brand":"AquaMagic Depot","offers":[{"title":"Default Title","offer_id":44966450004176,"sku":"3903-BP","price":61.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0639\/8453\/3712\/files\/3903-BP.png?v=1774302938","url":"https:\/\/aquamagicdepot.com\/products\/tecmark-1-5-psi-1-8-npt-pressure-switch-3903-bp","provider":"AquaMagic Depot","version":"1.0","type":"link"}