NIBCO Inc. manufactures pipe, valves, and fittings for plumbing, HVAC, irrigation, fire-protection, and industrial markets. Its copper, bronze, brass, iron, and PVC product range serves contractors and engineers worldwide.

Oatey is a leading supplier of plumbing rough-in products including supply boxes, drains, traps, solvent cements, sealants, and water-supply boxes. The Cleveland-based brand has been an everyday staple for plumbers since 1916.

Oetiker manufactures stepless ear clamps, hose clamps, and quick connectors used in plumbing, automotive, and industrial applications. Its single-ear and two-ear clamps are a long-running standard for stainless steel hose connections.

Oil Creek Plastics produces PVC pipe, fittings, and conduit for plumbing, irrigation, and electrical use. The Pennsylvania-based brand is sold through plumbing and electrical wholesalers in the eastern U.S.

Packard supplies HVAC replacement parts including capacitors, contactors, motors, transformers, and relays. Its components are stocked by HVAC service companies for furnace, condenser, and air-handler service.

Paige Electric (Paige Irrigation) manufactures low-voltage and direct-burial wire used to connect irrigation controllers to remote valves. Its UL-listed wire is a daily install for irrigation contractors and landscape lighting installers.

Panasonic Eco Systems makes ventilation fans (WhisperGreen, WhisperCeiling) along with mini-split air conditioners, ductless heat pumps, and indoor-air-quality products. Its bath fans are widely specified for high-performance and Passive House construction.

PHD Manufacturing produces engineered pipe hangers, supports, and seismic restraints for mechanical, fire-protection, and process piping. The brand serves mechanical contractors on commercial and industrial projects.

Polyken Pipeline Coatings, owned by Berry Global, produces tape-based pipeline corrosion-protection systems for buried and exposed steel pipe. Its YGIII and similar tapes are widely used on oil, gas, and water transmission lines.

Potter Roemer Fire Pro produces fire-protection equipment including hose cabinets, valves, fire department connections, and extinguishers. The brand is a longstanding fixture in commercial standpipe and hose-station installations.