ROYTRONIC® Series A/P+ Chemical Metering Pumps are positive displacement, Liquifram™ pumps with an NEMA 4X/IP-65 enclosure. Relevant model codes are NSF, UL/CUL or CE certified and offer control options and improved electro-magnetics to meet all flow / pressure ratings. Designed for Commercial applications, the pumps are available for applications up to 250 psi with capacities between .001 and 2.0 GPH. Dual manual control options with pulse input or 4-20 mA input are available. Standard FastPrime™ Liquid Ends are equipped with a valve that allows for opening the head to atmospheric pressure to assist in pump priming. Standard half-inch NPT connections allow for ease of configuration. Ferrule designed fittings offer secure, leak-proof tubing connections.