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We use food-grade vegetable oil and non-toxic plumber's pipe dope (Anti-Seize AST PPD) only in the installation process. One end of the adapter has a quick-connect plug designed to connect to most air compressors. The other end can be customized into five Male National Pipe Thread (MNPT) connections (1/4" MNPT, 3/8" MNPT, 1/2" MNPT, 3/4" MNPT, and 1" MNPT) and three Female National Pipe Thread (FNPT) connections (1/2" FNPT, 3/4" FNPT, and 1" FNPT,) to fit most home underground sprinkler systems. We ship from Andover, Kansas, USA. As a Better Business Bureau Accredited Business, we are committed to the highest ethical standards of business conduct. SUPER FAST SHIPPING! ALL ORDERS ARE SHIPPED BY USPS WITHIN 24 HOURS, MOST DELIVERED WITHIN 1-3 BUSINESS DAYS