4" Bulkhead (5 5/8" Opening) - Round Nut

TotalFount 4" pond liner bulkhead fitting, round nut — slip-fit through-liner fitting for creating watertight pipe penetrations in EPDM and PVC pond liners.

The TotalFount round-nut bulkhead fitting creates a reliable, watertight penetration through pond liner material for connecting piping to skimmers, bottom drains, fill valves, and other pond components that require flow through the liner wall. The 4" slip-fit connection accepts standard PVC pipe and fittings without threading.

Installation requires a 5-5/8" hole cut in the liner. The flat sealing washer compresses against both liner faces as the round nut is tightened, creating a waterproof seal without adhesive or tape. Compatible with EPDM, PVC, and RPE pond liner materials; stainless hardware recommended for long-term submerged installations.