PSS Shaft Seal 03-200-234 2" PRO Silicone Shaft Seal 2-3/4" Stern Tube

The PSS PRO Shaft Seal is a premium mechanical face seal designed for marine propulsion systems requiring maximum durability in harsh, corrosive, and high-pressure environments. This 2-inch shaft seal features PSS's proven stainless steel and carbon sealing technology with upgraded components including reinforced silicone bellows, 316 stainless steel hose clamps with rolled edges, and optional Nitronic 50 rotor for extreme conditions.

Key Specifications:

• Shaft diameter: 2 inches
• Stern tube diameter: 2-3/4 to 2-7/8 inches
• ABS, RINA, and Bureau Veritas certified
• Operating temperature range: -90°F to +425°F (-70°C to +220°C)

How It Works:

The PSS PRO creates a watertight seal through precision-mated carbon stator and stainless steel rotor faces. Two nitrile o-rings seal the rotor to the shaft without experiencing wear. The stationary carbon stator attaches to reinforced silicone bellows secured to the stern tube with premium 316 stainless steel hose clamps. On high-speed vessels, raw water feeds to the seal faces for cooling and lubrication.

Premium Components:

• 316L Stainless Steel Rotor: Computer-machined with number 9 micro finish, secured with 90° set screws for maximum holding power
• High-Density Carbon/Graphite Stator: Resin-impregnated composite finished to 4 helium light bands flatness, proven to exceed 40,000 engine hours in commercial applications
• Reinforced Silicone Bellows: Four-ply aramid or silicone construction with fluorosilicone outer layer providing oil and fuel resistance
• Shaft Retention Collar: Double-split design retains propeller or rudder shaft during coupling failure without marring the shaft
• Premium Hose Clamps: 316 stainless steel with rolled edges, non-perforated bands, and protective clamp jackets

What's Included:

• Stainless steel rotor assembly
• Carbon graphite stator
• Reinforced silicone bellows with fluorosilicone outer
• Shaft retention collar
• 316 stainless steel hose clamps
• Nitrile o-rings

The PSS PRO Shaft Seal eliminates traditional stuffing box maintenance and dripping while providing unmatched performance in commercial and recreational marine applications. The carbon stator's 500°F operating temperature prevents damage if the seal runs dry, unlike rubber lip seals or plastic face seals.