{"product_id":"castair-1-2-discharge-tube-with-fittings-dt12","title":"Castair 1\/2\" Discharge Tube with Fittings DT12","description":"\u003cp\u003eThe Castair DT12 is a 1\/2-inch discharge tube assembly with fittings — a pre-built copper or steel discharge tube used to connect your air compressor pump's discharge outlet to the tank or downstream plumbing. The discharge tube handles the hottest, highest-pressure point in the compressor air path: right after the pump outlet, before the check valve and tank. At that location, air temperatures can exceed 300°F and pressure regularly hits the compressor's cutout pressure (typically 125–175 PSI depending on setup). This is not a job for rubber hose — you need a proper rigid discharge tube rated for the thermal and pressure conditions at pump discharge.\u003c\/p\u003e\n\n\u003ch2\u003eWhy the Discharge Tube Matters\u003c\/h2\u003e\n\u003cp\u003eThe discharge connection between the pump outlet and the tank is one of the most failure-prone points on any compressor. Common failure modes include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRubber hose degradation:\u003c\/strong\u003e High-temperature air at pump discharge will cook rubber hose from the inside out over time. Cracks develop, hoses blow off under pressure, and you get a sudden loss of pressure and potential injury hazard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVibration fatigue:\u003c\/strong\u003e The pump vibrates during operation. If the discharge connection is rigid pipe without any flex or vibration isolation, the fittings work-loosen over time and eventually crack or leak.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproper sizing:\u003c\/strong\u003e An undersized discharge tube creates backpressure that forces the pump to work harder and run hotter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe DT12 is sized at 1\/2 inch — appropriate for single-cylinder and smaller two-cylinder pumps where 1\/2\" discharge tubing matches the pump's outlet port size. For larger two-stage pumps, the 3\/4\" DT34 is the correct size.\u003c\/p\u003e\n\n\u003ch2\u003eWhat You Get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/2\" discharge tube\u003c\/strong\u003e — proper diameter for the pump outlet connection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFittings included\u003c\/strong\u003e — compression or threaded fittings to connect both ends of the tube\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: Exact tube length, material (copper vs. steel), and fitting type details are not published in Castair's catalog for this part. The discharge tube page lists DT12 as \"1\/2-inch discharge tube with fittings\" — contact us to confirm the exact length and configuration before ordering if your installation has specific dimension requirements.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eWhere This Part Is Used\u003c\/h2\u003e\n\u003cp\u003eThe DT12 fits compressor builds and rebuilds using pumps with 1\/2\" discharge ports. Based on Castair's pump lineup, that covers the smaller single-cylinder pumps (PK20, DD20, PK30) and some smaller two-cylinder configurations. When you're rebuilding a pump, replacing a cracked or leaking discharge tube, or building a new compressor from components, the DT12 is the correct discharge tube for 1\/2\" outlet pumps.\u003c\/p\u003e\n\n\u003ch3\u003eCompanion Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDT34:\u003c\/strong\u003e 3\/4\" discharge tube — for larger pumps with 3\/4\" outlet ports\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCA1212:\u003c\/strong\u003e Compression adaptor 1\/2\"x1\/2\" — if you need to adapt tube to port size\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCE1212:\u003c\/strong\u003e Compression elbow 1\/2\"x1\/2\" — for directional routing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNS12:\u003c\/strong\u003e Compression nut and sleeve for 1\/2\" tube — for making additional compression connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhen to Replace Your Discharge Tube\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAny visible cracking, pitting, or corrosion on the tube body\u003c\/li\u003e\n\u003cli\u003eLeaking at either fitting connection that can't be stopped by tightening\u003c\/li\u003e\n\u003cli\u003eDuring any pump rebuild — if the pump is getting new valves and rings, replace the discharge tube at the same time\u003c\/li\u003e\n\u003cli\u003eIf the existing tube is rubber — replace with the proper rigid discharge tube\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecialist since 2016\u003c\/strong\u003e — we stock Castair discharge tubes and fittings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree shipping\u003c\/strong\u003e on qualifying orders\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree tech support at 866-217-0063\u003c\/strong\u003e — call us to confirm the right discharge tube size for your pump\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull manufacturer warranty\u003c\/strong\u003e on Castair parts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHonest guidance\u003c\/strong\u003e — if you need the DT34 instead, we'll tell you\u003c\/li\u003e\n\u003c\/ul\u003e\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":53342547181781,"sku":"DT12","price":68.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/DischargeTubewithFittings.jpg?v=1772652668","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-1-2-discharge-tube-with-fittings-dt12","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}