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Not that it matters here since you want to replace the fitting but for others ... the fittings on the hydraulic systems in our fivers do not require any sealant or tape as they are o-ring fittings or metal to metal AN type fittings such as the cap here. Thread tape on the threads does nothing as the threads are straight threads and do none of the sealing. There may be an odd ball tapered pipe fitting on the hydraulics on someone's RV, but they will be few and far between. I'd imagine you have tee fittings because they ran out of 90's and that was what was available the day your unit was made. We have gazillions of the metal to metal AN type fittings at work ... we seldom have leaks. If we do it's usually a nick in the metal taper or a cracked hard line.
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