Muti-size Solder Union(Charging valve) Quick Detail: Brand Name:NPTCMaterial:copperFunction: ... Clients Requests.Delivery Detail:20-30days after receiving the deposit Specification:Muti-size Solder Union(Charging valve)NPTC-7000:With 5 steps ... ",1/4",5/16",3/8" and 1/2" O.D. tube use.NPTC-7001: With 3 steps for 1/8 ... ", 1/4",3/8" and 1/2" O.D. tube use.NPTC-7002: With 2 steps for 1/4 ...