Designed to economically handle relatively high flows in a compact package this is a versatile heat exchanger. Utilizing a straight self cleaning corrugated tube are OEM friendly, and manufactured to meet ASME codes. 316L stainless steel ASME rating of 250 psi @ 406F. Female NPT connections. Straight corrugated tubes non-removable parts. Pool capacity 44,000 Gal, 5.65 in. width, 4 in. diameter, 43.54 in. long, 2" NPTF x 1 in. NPT