Top Pick Loctite® 565™ PST® Thread Sealant, controlled strength, is formulated specifically for metal tapered pipe thread fittings. Controlled lubricity prevents galling and protects from rust and corrosion. Loctite 565 PST replaces most tapes and pipe dopes. Cures rapidly to withstand 10,000 psi. Perfect as a replacement for pre-coated parts. Can be used on fittings up to 2 in. (50 mm) in diameter.