Ronstan Utility Block, Series 30 - Single, Swivel Ring Head thermostat The 2 Boston valves have

The 2 Boston valves have different thread patterns

- Mount holes Dia

suits Late Model Bravo & High Performance - 350 Mag - 4

Single or Double V Belt Pulley Available2028 pulley suit Soft Clutch/VDrive/Velvet Drive & Jet set up

These impeller housings won't corrode

Ronstan Utility Block, Series 30 - Single, Swivel Ring Head thermostat The 2 Boston valves haveStainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be fitted with shackles, which can also be used to add a becket for extra purchase. Features: Lightweight durable construction Economical Maintenance free Applications: Vang, cunningham and trapeze retriever systems on dinghies Leech line tackles, bunk adjusters etc on larger yachts Materials: U. V. stabilised Acetal