MALE RUN TEE Parker's Prestolok PLM metal fittings have a high phosphorous, FDA compliant, electroless nickel plating which is resistant to water, harsh detergents and other aggressive fluids. All Prestolok PLM fittings are 100% leak tested and date coded to guarantee quality and traceability. The spring collet gripping system makes the Prestolok PLM fitting suitable for both metal grooved and polymer tubing.