This gas pack is the entry level gas pack that includes a Hurlcon HX70 72Mega Jule Natural or LPG heater with a 15mm or 1/2" Gas inlet and 40mm slip pressure pipe water inlets and outlets.It also comes with a 1.5Horse Power CX Hurlcon self priming pump and a 75Square Foot filter cartridge. This pack is our web site speacial and comes also with a Hurlcon Dual Air switch with time clock and a Hurlcon 1000Watt SX blower 5amp. This is all you will need for a one pump spa system to get you up and running with your spa plumbed shell.