These drinking fountain parts have a 1/4" NPT female connection. Contains 7701PFLF cartridge regulator. Also available with 5/16" diameter connections for brazing. Pressure rating is 120 PSI/8 BAR. Cartridge regulators/holders are NSF listed to ANSI/NSF Std. 61 Annex G. Cartridge regulators and cartridge holders are lead-free.