PSS Shaft Seal 1-3/8" Shaft 2-1/4" Tube

The PSS Shaft Seal 1-3/8" Shaft 2-1/4" Tube is the marine industry's leading mechanical seal system, engineered to prevent water intrusion at the propeller shaft exit—the most critical vulnerability point in any boat's hull integrity. This shaft seal assembly is installed as OEM standard equipment by major marine manufacturers worldwide and represents the gold standard in propeller shaft sealing technology for both recreational and commercial vessels.

Designed for 1-3/8" shaft diameter applications with a 2-1/4" to 2-3/8" stern tube, this PSS seal delivers a total compressed length of 6.38 inches and operates on proven carbon-face mechanical seal technology. The 2.5" carbon cuff diameter and precision-engineered rotor (2.875" diameter) create a dynamic seal that self-adjusts under operating conditions, eliminating the drip rates and maintenance headaches associated with traditional rubber lip seals. The 1.5" stern cuff length provides solid bearing surface and axial stability, critical for vessels operating in rough seas or under sustained throttle.

Weekend fishermen and serious offshore anglers choose the PSS shaft seal when performance and reliability matter. This system virtually eliminates the salted bilge water problem that erodes engine bearings and corrodes through-hull fittings over time. Whether you're running a center console in the Gulf, a displacement cruiser through coastal waterways, or a working boat that logs hours daily, a properly installed PSS seal reduces maintenance cycles and extends the service life of drive train components. The seal is compatible with both inboard engines and shaft-drive configurations common in modern sportfish boats and cruising yachts.

PSS shaft seals are available in multiple shaft and tube diameter combinations to fit various vessel configurations. This specific model—1-3/8" shaft with 2-1/4" tube—covers a broad range of mid-size powerboats and auxiliary-engine sailboats. Proper installation with marine-grade sealant and correct compression at the stern tube is essential to maximize seal life and performance. Many boaters report zero weeping or seepage after installation, a dramatic improvement over conventional rope seals that commonly allow small amounts of water circulation.