Ronstan Series 40mm Single Universal Head Block, Becket Propellers The inner lid can be

The inner lid can be thrown away or reused in the event you want to store the gel

Port lights

it leaves a layer of 45% solid PTFE between threads and all other contacts

silicone sealant engineered to withstand the harsh marine environment

Ronstan Series 40mm Single Universal Head Block, Becket Propellers The inner lid can beAll purpose (AP) blocks are a great all around solution. Self lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing. Captive Lock universal head can be fixed in either of two planes, or free to swivel as required.