Tigre USA 1" MPT Insert Elbow. Poly insert fittings are connected to PE Polyethylene pipe with stainless steel clamps. It is for use with COLD water only. Do not use with compressed air or gases. Do not use in a dwelling. It is ASTM D-2609 Listed. It is NSF 14 and 16 Listed for potable water services. Connects Female Threaded Pipe To Polyethylene Pipe In A 90-Degree Bend In Cold Water Applications Only. Can Be Used Underground Or Above Ground For Pool And Spa Applications, Water Service And Agriculture Uses. NSF Approved.