PLASTIC PLUMBING FITTINGS Straight thru-hull fittings White polyamide, compatible with most silicone sealants. Easy mounting. Overall length Hose Ø Int. Ø Drill Ø Ext. Ø Max. hull thickness Reference 88 mm 21 mm 15 mm 26 mm 45 mm 30 mm 16709 80 mm 25 mm 19 mm 30 mm 53 mm 30 mm 39473 124 mm 28 mm 35 mm 21 mm 42 mm 61 mm 37 mm 16711 121 mm 38 mm 32 mm 48 mm 70 mm 35 mm 16710