... , B, and C type 5 gallon cap. 2738 for core, P20 for base. HRC48-51.life: 3,000,000 time 5 gallon ... C type 5 gallon cap2738 for core, P20 for base. HRC48-51. life: 3,000,000 times;2738 for core, P20 for base. HRC48-51, mold ... . Advanced structure is designed in base of 2738 material;2. Core and cavity are made of imported nitrated steel in accordance ...