Debating between one Abyzz A200 or 2 RD3 Speedy 100s. Thoughts? Abyzz 50 mm outlet would have to be stepped down to 1" either at the pump outlet or at the Tee to the manifold. Dual RD3s (5"x9.25" footprint) are going to be a tight fit in my sump return section (6.25" x 19"), but will fit. Whether it leaves enough gap for the suctions to perform correctly is a different question. Better fit with the Abyzz, redundancy with the RD3s...cost is roughly equivalent (close enough not to weigh in decision)