I just use rubber block off caps from Repco. I have a bag of various sizes and clamps in the glove box should any of them fail. In the old days I just used a piece of wood and made it fit with the old roo skinning knife and shoved it up the hose and did the clamp up. Bit rough but it worked. You can also get tapered plugs from Repco to block holes in the block, just be careful doing them up because the further you go the tighter they get.