Safety SPA Suction 40mm pipeMeet the Safety SPA Suction 40mm pipea purpose built through wall fitting engineered for secure spa plumbing. Designed to pass a 40mm pipe through a wall with a 50mm back nut, this unit delivers a reliable, leak resistant connection in humid spa spaces. Through wall connection accommodates a 40mm pipe with a 50mm back nut for a stable, tight seal that stands up to routine spa use. Precise sizing hole fit size 61mm ensures accurate alignment and clean