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I have a faucet which requires installation of a separate threaded 'shank' or nipple which acts as both the water supply inlet and also is used to anchor the faucet to the sink deck. These are supplied as separate parts to allow for varying thickness of countertops.

(Shown in the photo below - one male end of the shank goes into the faucet body, the other end protrudes through the sink and is fastened tight with the nut & washer).

These shanks have a 1/2" IPS straight thread. They are not NPT tapered. So I was expecting to use a rubber O-ring or washer when screwing them into the faucet. However there is no 'seat' or other surface in the faucet where such a part could go. It would literally just get lost inside the body of the faucet (before the valve).

I had thought the golden rule was that tapered threads require sealant (or tape) and straight threads require a washer/o-ring. But this faucet seems to allow for neither. The instructions with the faucet don't say.

I attempted to take apart some other old faucets to see how this was done, but the shanks were impossible to unscrew.

So - how can I seal these parts?

(Note - the faucet happens to be a Whitehaus WHFS9813-12-C.)

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The scenario you've described is not ideal. The faucet was manufactured to a sub-optimal design. In this case, you must either select a different faucet, or improvise. Chicago Faucet has been using this same type of design on their wall and deck faucets for many years. They use an adhesive on their straight threads from the factory.

@DaveInCaz suggested you use a thread sealant. I would recommend an anerobic pipe thread sealant. Allow the nipple to cure into the faucet before attempting to connect your supply lines to the nipples. The torque you apply to tighten the supply line to each nipple could break the seal between the nipple and the faucet if you don't.

Your alternate choice is to select a different faucet.

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I use a product called "LeakLock" it comes in a tube and is a blue paste, like teflon paste only much better, this stuff seals everything from refrigerants to water to gas, any pressures, available online or at appliance parts stores and HVAC parts houses, like Jonstone supply, Standard Appliance Ebay and Amazon sell it too.

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