{"product_id":"brass-npt-inline-spring-check-valve-female-thread-anti-backflow","title":"Brass NPT In-Line Spring Check Valve 1\/2\" 3\/4\" 1-1\/2\" Female","description":"\u003ch2\u003eBrass Female NPT In-Line Spring Check Valve\u003c\/h2\u003e\n\u003cp\u003eKeep your plumbing system flowing in one direction with this durable \u003cstrong\u003eBrass In-Line Spring Check Valve\u003c\/strong\u003e. Available in three standard female NPT thread sizes — \u003cstrong\u003e1\/2\", 3\/4\", and 1-1\/2\"\u003c\/strong\u003e — this one-way anti-backflow valve is an essential component for residential, commercial, and irrigation plumbing applications. The spring-loaded ball mechanism provides a positive seal that prevents reverse flow, water hammer, and backflow contamination without requiring any electrical power to operate.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose This Check Valve?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePremium Brass Construction:\u003c\/strong\u003e Corrosion-resistant solid brass body ensures long-lasting performance in both hot and cold water systems.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBall-Type Spring Mechanism:\u003c\/strong\u003e Reliable spring-loaded ball structure delivers consistent one-way flow control and a tight, leak-free seal.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThree Size Options:\u003c\/strong\u003e Available in 1\/2\", 3\/4\", and 1-1\/2\" female NPT thread sizes to suit a wide range of pipe configurations.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectricity-Free Operation:\u003c\/strong\u003e Fully mechanical design — no wiring, no power source, no maintenance headaches.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAnti-Backflow Protection:\u003c\/strong\u003e Prevents water from flowing backward through your plumbing line, protecting pumps, boilers, irrigation systems, and water supply lines.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Female NPT threading makes installation straightforward on standard plumbing fixtures and pipe fittings.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Applications:\u003c\/strong\u003e Ideal for garden irrigation, water pumps, boiler systems, HVAC lines, water treatment setups, and general plumbing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e Female NPT (National Pipe Thread)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAvailable Sizes:\u003c\/strong\u003e 1\/2\", 3\/4\", 1-1\/2\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eValve Structure:\u003c\/strong\u003e Spring-loaded ball\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e Electricity-free \/ Fully mechanical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlow Direction:\u003c\/strong\u003e One-way (anti-backflow)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Made in China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-inch-impact-rocker-sprinkler-adjustable-rotating-irrigation\"\u003e1-Inch Impact Rocker Sprinkler – Adjustable Rotating Irrigation\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-4w-solar-bird-bath-fountain-pump-garden-pond-fish-tank-1\"\u003e1.4W Solar Bird Bath Fountain Pump – Pond, Garden \u0026amp; Fish Tank\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHelpful Resources\u003c\/h3\u003e\n\u003cp\u003eFor guidance on safe plumbing practices and backflow prevention standards, visit the U.S. EPA Drinking Water Regulations page.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Check_valve\" target=\"_blank\" rel=\"noopener\"\u003eCheck valve\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What sizes does this brass check valve come in?\u003c\/h4\u003e\n\u003cp\u003eA: This in-line spring check valve is available in three female NPT thread sizes: 1\/2\", 3\/4\", and 1-1\/2\". Select the size that matches your existing pipe or fitting diameter for a seamless installation.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is a spring check valve and how does it work?\u003c\/h4\u003e\n\u003cp\u003eA: A spring check valve is a one-way flow control device. Inside the brass body, a spring-loaded ball sits against a seat. Water pressure from the inlet side pushes the ball open to allow forward flow. When pressure drops or reverses, the spring forces the ball back against the seat, instantly blocking any backflow. No electricity or manual operation is required.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What applications is this check valve suitable for?\u003c\/h4\u003e\n\u003cp\u003eA: This valve is well-suited for garden irrigation systems, water pumps, boiler lines, HVAC plumbing, water treatment systems, pool and spa plumbing, and any general plumbing application where one-way flow control is needed to prevent reverse flow or backflow contamination.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is professional installation required?\u003c\/h4\u003e\n\u003cp\u003eA: Installation is straightforward for anyone comfortable with basic plumbing. Simply thread the valve into your existing female NPT pipe or fitting using plumber's tape (PTFE tape) for a secure, leak-free seal. Always follow local plumbing codes and regulations, and consult a licensed plumber if you are unsure.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What sizes does this brass check valve come in?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This in-line spring check valve is available in three female NPT thread sizes: 1\/2\\\", 3\/4\\\", and 1-1\/2\\\". Select the size that matches your existing pipe or fitting diameter for a seamless installation.\"}}, {\"@type\": \"Question\", \"name\": \"What is a spring check valve and how does it work?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A spring check valve is a one-way flow control device. Inside the brass body, a spring-loaded ball sits against a seat. Water pressure from the inlet side pushes the ball open to allow forward flow. 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Always follow local plumbing codes and regulations, and consult a licensed plumber if you are unsure.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/oasis-select.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home \u0026 Living\", \"item\": \"https:\/\/oasis-select.com\/collections\/home-living\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Brass NPT In-Line Spring Check Valve 1\/2\\\" 3\/4\\\" 1-1\/2\\\" Female\", \"item\": \"https:\/\/oasis-select.com\/products\/brass-npt-inline-spring-check-valve-female-thread-anti-backflow\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"DN15","offer_id":47746752151657,"sku":"183:202170825","price":8.15,"currency_code":"USD","in_stock":true},{"title":"DN20","offer_id":47746752184425,"sku":"183:202170826","price":8.15,"currency_code":"USD","in_stock":true},{"title":"DN25","offer_id":47746752217193,"sku":"183:202170827","price":8.15,"currency_code":"USD","in_stock":true},{"title":"DN32","offer_id":47746752249961,"sku":"183:201036875","price":8.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/S61027e8202dc497483f7e4398512be3ev.webp?v=1783058143","url":"https:\/\/oasis-select.com\/products\/brass-npt-inline-spring-check-valve-female-thread-anti-backflow","provider":"Oasis Select","version":"1.0","type":"link"}