2.5 inch. If you need taller pipes to improve gravity flow thru the secondaries, or just looking to replace rusted-out pipes or older pipes that lack dimples to redistribute seed & fertilizer more uniformly as it goes up into distribution head. Other sizes available.
LEGACY P/N WAS SMA.Riser63.SS – Riser Pipe 63mm / 2.5″ – Stainless Steel