| Outdoor household faucet | Threaded faucet adapter with quick-connect plug | Standard garden hose with female threaded end | 3/4 in. garden-hose thread in North America; verify local thread standard | Usually suitable for normal residential supply pressure; check the connector rating | Garden watering, washing, and general outdoor use | Garden-hose thread is not the same as pipe thread. Confirm whether the faucet outlet is male or female before purchasing. |
| Indoor faucet | Faucet aerator adapter with hose connector | Small-diameter utility hose or portable washing hose | Aerator-specific male or female thread; sizes vary by faucet | Low to moderate household pressure | Temporary filling, cleaning, and indoor utility tasks | Remove the aerator and measure the thread or use the faucet model information. Do not force mismatched threads. |
| Rain barrel or storage tank | Bulkhead fitting, tank adapter, or barbed outlet with clamp | Flexible hose, reinforced vinyl hose, or low-pressure garden hose | Common outlet sizes include 1/2 in. and 3/4 in.; match the actual tank outlet | Low pressure unless a pump is installed | Gravity-fed irrigation and water transfer | Use a gasketed bulkhead fitting to prevent leaks through the tank wall. A gravity-fed system may not provide enough pressure for sprinklers. |
| Low-pressure transfer pump | Barbed adapter with stainless-steel hose clamp | Flexible hose with a smooth or reinforced inner wall | 1/2 in., 5/8 in., or 3/4 in. hose inside diameter, matched to the pump port | Must exceed the pump's maximum pressure and flow requirements | Draining tanks, moving clean water, and light irrigation | Measure the hose inside diameter, not its outside diameter. Secure the hose fully over the barb and tighten the clamp without cutting the hose. |
| Pressurized irrigation line | Threaded compression fitting or irrigation quick-connect fitting | Polyethylene irrigation tubing or drip tubing | Common tubing sizes include 1/2 in. and 5/8 in.; use the fitting specified for the tubing size | Select a rating above the system's operating pressure | Drip irrigation, garden beds, and low-volume watering | Compression fittings are normally more reliable than plain push-on fittings for permanent outdoor installations. |
| Large water pump or filtration system | Threaded union, cam-and-groove coupling, or flanged connector | Large reinforced hose or rigid pipe | Common nominal sizes include 1 in., 1-1/2 in., and 2 in.; match the port diameter | Use the connector's rated working pressure, temperature, and fluid compatibility | High-flow transfer, filtration, and pool or pond circulation | Cam-and-groove couplings are convenient for frequent disconnection but should not be used where accidental release would create a hazard. |
| Pressure washer outlet | Pressure-rated quick-connect fitting | High-pressure hose designed for pressure-washing equipment | Often 1/4 in. or 3/8 in. quick-connect sizes; verify the equipment specification | Must exceed the washer's maximum working pressure | Vehicle, patio, driveway, and equipment cleaning | Do not substitute ordinary garden-hose quick-connectors for high-pressure fittings. Check both pressure and temperature ratings. |
| Food-contact or potable-water system | Potable-water-rated threaded or quick-connect fitting | Certified drinking-water hose or tubing | Thread and tube size must match the hose and appliance inlet | Follow the pressure rating of the hose, fitting, and appliance | RV water supply, beverage equipment, and drinking-water storage | Choose materials approved for potable water in the intended country or region. Avoid fittings with unknown coatings or material specifications. |
| Hot-water source | Temperature-rated threaded connector or metal swivel fitting | Hot-water-rated hose, reinforced rubber hose, or approved thermoplastic hose | Match the source thread and the hose connection size | Must be rated for the maximum water temperature and pressure | Equipment cleaning and controlled hot-water transfer | Temperature can reduce hose strength and shorten seal life. Check the lowest-rated component in the complete connection. |