The feed pipes are made from SPX plastic, braided with stainless steel. The connecting nuts are 3/8” and made from brass with 3/8" copper pipe. The waste pipe is flexible, corrugated white PVC with a diameter of 1.3". We do not recommend flushing the waste hose with formaldehyde. The elbow with removable connector is made from PP (polypropylene) with a seal of TPE (thermoplastic elastomer). Maximum temperatures of use are 176°F (continuous use) and 194°F (temporary use). PP is very resistant to water, damp and most organic solvents. The seal is made from EPDM – Temperature of use from -58°F - +248°F/305°F EPDM is particularly resistant to ozone and weather. Good resistance to heat and cold and to most chemicals – but poor resistance to petroleum products and solvents.