Does this brass cap include an internal gasket

What material are these gaskets made from

315602 is identical to 315602/U

As a direct OEM replacement

and aluminum tubing

Mueller W04017 3/4" Tee Does this brass cap includeWhen you're pulling a 3 4 inch branch off a main supply line, you need a fitting that stands up to the thermal stress and pressure of a high demand HVACR or plumbing system. The Mueller W04017 3 4" Tee is a professional grade wrot copper solder joint fitting engineered to ASME B16. 22 standards. This C x C x C (Cup x Cup x Cup) pressure tee features a 3 4" Outside Diameter (O. D.) to match 5 8" nominal size tubing, making it a standard requirement for