Pen Sac - Size 16 Straight. 16/64 inch diameter latex pen sac (one of the most popular sizes) for many fountain pens, including Esterbrook, Sheaffer, Parker, Waterman and others.

Pen Sac - Size 14 Straight. 14/64 inch diameter latex pen sac for Sheaffer Snorkels and smaller fountain pens. While totally non-pen related, the smaller sized sacs, usually #10, #12 and #14 are used by model airplane enthusiasts for fuel tanks!

Pen Sac - Size 10 Straight. 10/64 inch diameter latex pen sac for small fountain pens, ie: Salz, Peter Pan pens. While totally non-pen related, the smaller sized sacs, usually #10, #12 and #14 are used by model airplane enthusiasts for fuel tanks!

Pendemonium Sac Assortment - 10 of the most popular sizes includes: 1 each of #14, #20, 2 each of #15, #16, #17, #18 latex pen sacs and basic instructions on sac replacement excerpted from Frank Dubiel's book, Complete Guide to Fountain Pen Repair and Restoration, published by Pendemonium.. We carry most sizes of pen sacs and diaphragms. If you are unsure as to what size sac to order, feel free to email us for assistance. Pen sac diameters are measured in 64ths of an inch. For example, a #14 size pen sac is 14/64 inch.

Parker Vacumatic Repair Kit. This kit includes 3 latex standard diaphragms and detailed instructions on restoration excerpted from Frank Dubiel's book, Complete Guide to Fountain Pen Repair and Restoration, published by Pendemonium. The kit includes everything you need to restore three Vacumatic fountain pens pens.