Designed for use with 1 inch Schedule 40 PVC Pipe. Pipe ID - 1'' (25mm) Pipe OD - 1.315'' (33mm) Holesaw size: 1.75'' (44mm) Up to 12mm Wall Thickness. Chemical & Weather Resistant: TPV bulk head fittings 1 inch pvc bulkhead fitting resists acids, oils, grease, heat & sewage. Built for long-lasting hydroponics & drainage performance. 1 aquarium bulkhead 1 inch bulkhead: Pipe ID 1 (25mm), OD 1.315 (33mm), requires 1.75 holesaw (44mm), handles up to 15/32 (12mm) wall thickness Versatile pond bulkhead: Hydroseal secures 1 pipes to curved drums and buckets, easily handling surface irregularities where a standard bulkhead fitting 1 inch fails. Easy-install pvc bulkhead fitting bulkhead fitting double threaded — drill, insert, push. No glue, bolts, or clamps. Withstands pressure, suction, oils, grease, sewage, heat & cold. Saves time & cost. Leak-Proof aquarium bulkhead: High-friction TPV grips tight for a watertight pass-through. Fits 1 PVC holes & seals as securely as a threaded 1 inch pvc to garden hose adapter — no drips. ASIN B0G5Z5HSHF Size 1 inches-2Pcs Color White Set Name HYDROSEAL Flexible Tank Adapter Brand Name Siamseal Item Weight 0.05 Pounds Thread Size 1 inches Manufacturer Siamseal Model Number Benjas 2016 Co., Ltd. Material Type Thermoplastic Vulcanizate (TPV) Connector Type flexible tank adapter Exterior Finish Smooth Item Dimensions 2.44 x 2.44 x 0.75 inches Number of Pieces 2 Included Components Curve Grommets