Our Heavy-Duty Garden Hose series is constructed from high density multi-ply poly-vinyl chloride tubing with durable zinc-alloy plated metal couplings. It has a contractor-rated 5/8" inner diameter for maxium water flow, and is burst pressure rated at over 400 PSI. If there are any issues using our Heavy Duty Garden Hose series, it features our professional 2-year no-questions-asked full manufacturer's warranty for complete coverage.