4" Vent - Typically used on USP Eight Cox FootStop & Stern Sectional 4's. Now with improved seal & 1/4 turn lock.

5" Vent - Standard use in all SP Singles through to Eights, USP Singles, Pair/Doubles & Fours. Now with improved seal & 1/4 turn lock.

6" Vent - Standard use in all USP 8's. Now with improved seal & 1/4 turn lock.

Come with replacment nylon hardware. Silicone sealent (not supplied) is recomended if changing lock ring.