1 inch shut off valve from The Original Safety Siphon. This easy to use and install shut off valve is durable and fits conveniently with a 1 ID hose and stays put with a single barbed connected at each end. The handle is a breeze to manipulate allowing for quickly turning on/off all water flow or regulate to a precise amount of drip flow that you want for your plants, flowers, etc. The plastic is constructed out of thermoplastic acetal and works well with cold or warm water.