Caps form a closed end to an otherwise open plumbing line. Compression fittings are constructed of lead-free brass and are ideal for multiple potable water and other liquid plumbing systems. Each compression connection for each fitting comes with a ferrule and insert for a secure project installation. This type of fitting is ideal for connecting to aluminum tubing, brass pipe, copper tubing and polyethylene tubing. Caps seal off open plumbing lines. Constructed of durable, lead-free brass. Brass is corrosion-resistant and can be used indoors and outdoors. Ferrules are included to compress onto the tubing. Inserts are designed for use in vinyl or polyethylene tubing types. Applications include air, gasoline, grease, ice makers, oil & water softeners. Compatible tube types include aluminum tubing, brass pipe, copper tubing and polyethylene tubing. Color/Finish Family: Gold. Sub Type: Cap. Type: Cap. Diameter (End 1): 5/8-in. Connection Type (End 1): Female. Fitting Type: Compression. For Use with RVs: No. Material: Brass. Maximum Working Temperature (Fahrenheit): 212. Minimum Working Temperature (Fahrenheit): 32. Package Quantity: 1. CA Residents: Prop 65 Warning(s): Yes. Complies with Federal Lead Guidelines: Yes. Safety Listing: IAPMO safety listing. UNSPSC: 40171700.