Hardly used submersible or external return pump. Can do a 450 gallon (vamptrev had it on his 450 said it was great) was planning on using it on my 300 but had a change of plans. Paid $125 from Blair who got it from vamptrev. Want $125 hasn't touched water since I've had it. Anyone thinking about getting a "big" tank this is your chance to get a bigger sump pump! Pick up only in Ann arbor. Text me 7343254711