Use a dry cloth to remove old Teflon tape, mineral deposits, or corrosion. The threads must be smooth.
Since you don’t have the physical pamphlet, follow these instructions exactly as they would appear in the official Peerless manual. peerless a112 18.1 m shower head manual
Typically 2.5 GPM (9.5 L/min) at 80 psi, though some high-efficiency models may be rated at 1.75 GPM . Use a dry cloth to remove old Teflon