Both models have 3/4" IPS ports

performance & price

Easy subwoofer system configuration is possible with the embedded low pass filters

rubber gaskets stop water in its tracks and integrated drainage channels keep water out

Used in Concert with Max Charge or ARS-5 Regulators

Bomar - Nibo Low-Profile Performance Hatches, Part No. N1070-10P - Clear Frame/Smoked Lens Sentry Both models have 3/4" IPSThis low profile hatch is in a semi flush style which is the latest style hatch. Internal hinges for clean appearance. Silver powder coat finish. Special marine aluminum alloy with high magnesium content. Tough acrylic top assures plivacy, yet allows in plenty of light. Extra heavy duty hinges, with a locked vent position. Leakproof.