309 Brass Threaded CutOff Switch Valve — DN15/20/25/32/40/50/65/80/100 (11l2 = DN40) A robust, easytoinstall brass cutoff switch valve designed for tap water and general piping systems. The Model 309 valve combines a thickened brass body with threaded connections to provide reliable isolation under temperature and pressure conditions. Available in a full range of DN sizes to suit residential and commercial piping. Key benefits Reliable isolation: Quickly shut off water flow for maintenance, repairs, or emergency situations. Durable construction: Thickened brass body resists corrosion and wear, improving service life compared with thinwalled valves. temperature and pressure capability: Built for demanding conditions where ordinary valves may fail. Simple installation: Threaded connection fits standard threaded piping; installation is straightforward with common plumbing tools. Versatile sizing: Available in DN15/20/25/32/40/50/65/80/100 to match common pipe diameters (Model 309, includes 11l2 = DN40). Key attributes Model: 309 Valve Material: Brass (thickening design for increased strength and longevity) Connection type: Threaded (suitable for standard threaded pipe systems) Sizes available: DN15 / DN20 / DN25 / DN32 / DN40 / DN50 / DN65 / DN80 / DN100 Function: Tap water pipe cutoff switch valve — on/off isolation for water lines Performance focus: Designed to withstand temperature and pressure in typical plumbing environments Compatibility and installation Designed to work with threaded water piping systems that match the listed DN sizes. Select the valve size that corresponds to your pipe nominal diameter. DN40 is shown as 11l2 in the product title. Thread engagement requires appropriate sealant or thread tape and standard wrench tools. Ensure correct tightening to prevent leaks without overtorquing. Use cases and applications Residential water shutoff: Install on incoming supply lines or branch lines to isolate fixtures, appliances, or sections of a home for maintenance or emergency shutoff. Commercial and building plumbing: Use in commercial washroom, utility, or service rooms where dependable, temperatureresistant isolation is required. Service and maintenance isolation: Fit on heating loop feeds, control valves, or temporary bypass lines where routine servicing requires reliable shutoff under pressure. Why choose this valve The Model 309 thickened brass design delivers a balance of strength and corrosion resistance for longterm performance. Threaded installation keeps replacements and upgrades straightforward, minimizing downtime. Wide size range supports a variety of installation scenarios without the need for custom fittings. Notes Confirm pipe thread type and compatibility before installation. Follow local plumbing codes and standard installation practices. The product listing includes the sizes and model information shown in the title: DN15/20/25/32/40/50/65/80/100, Model 309, and the designation 11l2 = DN40.