? Which is better? Galvanized pipe, galvanized steel pipe, galvanized square pipe, greenhouse pipe, greenhouse steel pipe, oval pipe, plastic-coated greenhouse pipe, vegetable greenhouse, multi-span greenhouse, simple greenhouse, Lycium barbarum greenhouse, oval greenhouse, serrated steel greenhouse, plastic-coated greenhouse, O-tube greenhouse, spring greenhouse, winter greenhouse, oval tube four-season greenhouse, greenhouse. Accessories, greenhouse bending lock, drilling and flattening.