Made from a high molecular weight linear Polyethylene formulated for chemical compatibility and high impact resistance at lower temperatures. Polyethylene is NSF approved for portable water. The temperature range is -65°F to 190°F. The working pressure is 125 PSI maximum. Midland Metals 33-429B Polyethylene Barb x Barb x Barb Tee fitting features a 3/8 in. x 3/8 in. x 3/8 in. dimension.