{"product_id":"castair-3-4x3-4-in-tank-check-valve-npt-female-fitting-inlet-npt-male-outlet","title":"Castair 3\/4\"X3\/4\" In Tank Check Valve NPT Female Fitting Inlet\/NPT Male Outlet","description":"\u003ch2\u003eCastair 3\/4\"x3\/4\" In-Tank Check Valve NPT Female Fitting Inlet \/ NPT Male Outlet CTB3434\u003c\/h2\u003e\n\n\u003cp\u003eThe Castair CTB3434 is a 3\/4\" x 3\/4\" in-tank check valve with NPT female inlet and NPT male outlet. At $31.34, it's the correct factory replacement for mid-to-large commercial reciprocating compressors running 3\/4\" NPT connections in the discharge circuit. Rated to 500 PSIG and 400 degrees F with a 1\/8\" unloader port. If your compressor head has a 3\/4\" male discharge port and your tank has a 3\/4\" bung, this is the check valve you need.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e CTB3434\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInlet Connection:\u003c\/strong\u003e 3\/4\" NPT Female\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutlet Connection:\u003c\/strong\u003e 3\/4\" NPT Male\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating:\u003c\/strong\u003e 500 PSIG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Rating:\u003c\/strong\u003e 400 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnloader Port:\u003c\/strong\u003e 1\/8\" side port\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e $31.34\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Castair (Spicer, Minnesota)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat This Valve Does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrevents backflow:\u003c\/strong\u003e Closes when the compressor unloads, holding tank pressure without loss through the compressor head\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnloader function:\u003c\/strong\u003e The 1\/8\" side port connects to the pressure switch unloader to bleed head pressure at each shutdown cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagnostic value:\u003c\/strong\u003e Short-cycling compressor or slow tank pressure loss when off often traces directly to a failed check valve — this is the first component to inspect\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCTB3434 vs. CTD3434\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCTB3434 (this listing):\u003c\/strong\u003e 3\/4\" NPT female inlet — threaded pipe connection. Use when discharge uses pipe fittings and nipples.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCTD3434:\u003c\/strong\u003e 3\/4\" compression tube fitting inlet. Use when 3\/4\" copper discharge tubing inserts directly into the valve.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFull CTB Series Reference\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCTB3812\u003c\/strong\u003e — 3\/8\" x 1\/2\", $21.18\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCTB1212\u003c\/strong\u003e — 1\/2\" x 1\/2\", $20.33\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCTB1234\u003c\/strong\u003e — 1\/2\" x 3\/4\", $29.65\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCTB3434\u003c\/strong\u003e — 3\/4\" x 3\/4\" (this listing), $31.34\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCTB1010\u003c\/strong\u003e — 1\" x 1\", $50.82\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCTB114114\u003c\/strong\u003e — 1-1\/4\" x 1-1\/4\" (call for price)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCTB112112\u003c\/strong\u003e — 1-1\/2\" x 1-1\/2\" (call for price)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cp\u003eWe stock the full Castair check valve line in all sizes and inlet styles. Call with your compressor model or discharge connection details and we'll confirm the correct valve before it ships.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree shipping\u003c\/strong\u003e on qualifying orders to the lower 48\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree tech support\u003c\/strong\u003e — fitment verification by phone\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull manufacturer warranty\u003c\/strong\u003e on all Castair products\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342534205653,"sku":"CTB3434","price":58.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/InTankCheckValve_21d61d04-2f04-4818-8358-35855cd403a3.jpg?v=1772652642","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-3-4x3-4-in-tank-check-valve-npt-female-fitting-inlet-npt-male-outlet","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}