What Adapter For

Kitchen and bathroom connections

Supply lines for faucets, toilets and appliances, shutoff valves, shower head threads, toilet flappers and P-traps.

Supply line sizes3/8" compression at the valve, 1/2" FIP at the faucet, 7/8" at the toilet. Toilet supply line size3/8" compression x 7/8" ballcock. Dishwasher water line3/8" compression at the valve; the other end suits the dishwasher. Dishwasher drain connectionThe disposal's inlet (plug out first) or a branch tailpiece, with a high loop or air gap. Ice maker water lineA valve with a 1/4" outlet and a 1/4" line. Washing machine hose size3/4" female hose thread at both ends. Washing machine drainA trap at least 2", the standpipe 18" to 42" above it, and the hose loose inside. Kitchen faucet to garden hoseAn aerator adapter from the faucet thread to hose thread. Faucet aerator sizeCompare it with a coin, then check which side the threads are on. Shower head thread size1/2" NPT in the US and Canada, 1/2" BSP in the UK, Australia and New Zealand. Shower hose thread sizeAmerican Standard, Delta and Moen wall elbows take a 1/2" NPSM hose; Kohler's take G1/2. Tub spout: slip-on or threadedA set screw under the spout means slip-on; no screw means it screws on. Toilet flapper size2-inch or 3-inch: measure the old flapper or the hole it covers. Toilet rough-inMeasure from the finished wall to the bolt caps: 10, 12 or 14 inches. Toilet flange sizeMatch the drain pipe: a 3 x 4 flange goes over 3" pipe or inside 4". P-trap size1-1/4" for a bathroom sink, 1-1/2" for a kitchen sink or tub, 2" for a washer. Shutoff valve sizeA 3/8" compression outlet; the inlet matches the pipe.

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General guidance from manufacturer and standards data. Parts vary by brand, so check the size printed on the package against what you measured. For gas lines or anything inside a wall, use a licensed plumber.