Dear Kstarestrella,
Normally our Dual D5 MOD TOP EXTREME (POM Version) is compatible with the D5 pump. But you have to choose our D5 mod kit (BP-D5MA-)series, not V2 version.And the inlet and outlet thread of Dual D5 MOD TOP EXTREME (POM Version) is IG3/8", not IG1/4".https://shop.bitspower.com/index.php?route=product/search&search=D5MA-